I Used 4 AI Coding Tools for 3 Months. Here’s My Honest Take.

I’ve been using AI coding tools full-time since January 2026. Not just testing them for a weekend – actually building production software with them daily.

After 3 months of real-world usage across Cursor, Claude Code, Windsurf, and GitHub Copilot, here’s what I actually think.

The TL;DR

Tool Best At Worst At Monthly Cost
Cursor Everyday coding + agent tasks Gets expensive fast $20-60
Claude Code Complex refactoring Learning curve $20-200
Windsurf Value for money Less powerful agent $15
Copilot Low-friction integration Weaker autonomy $10

But rankings don’t tell the real story. Let me explain.

Cursor: The Daily Driver

Cursor is where I spend 80% of my coding time. Two features make it irreplaceable:

1. Tab Completion That Actually Understands Context

Cursor doesn’t just complete the current line. It predicts what you’re about to do across multiple lines and shows it as a diff. One Tab press, and an entire function gets restructured.

This alone saves me 30-40 minutes per day. No exaggeration.

2. Agent Mode (Composer)

“Hey Cursor, add input validation to all the form handlers in this project.”

It scans the codebase, identifies the relevant files, makes the changes, and shows you a diff. You review and accept. Done.

The catch? Cursor’s credit system means heavy usage adds up. If you manually select premium models (like Claude Opus), you can burn through $60/month easily. The “Auto” mode is unlimited but uses cheaper models – which is fine 90% of the time.

Verdict: Best all-around tool if you’re willing to pay.

Claude Code: The Heavy Lifter

Claude Code is strange. It’s a terminal tool with no GUI, no autocomplete, no syntax highlighting. You type what you want in plain English, and it goes and does it.

And somehow, it’s the most reliable tool for complex tasks.

Where it shines:

I asked each tool to migrate an Express.js backend from JavaScript to TypeScript. Full migration – interfaces, type annotations, tsconfig, the works.

  • Claude Code: 12 files modified correctly on the first try
  • Cursor: 10/12 files, needed manual fixes
  • Windsurf: 8/12 files
  • Copilot: Needed 4+ rounds of prompting

The difference is Claude’s reasoning ability. It doesn’t just pattern-match – it understands what the migration requires and plans accordingly.

The catch? Rate limits are brutal. On the $20/month Pro plan, you get roughly 10-45 messages per 5-hour window. During peak hours, it’s on the lower end. I’ve been mid-refactor when the rate limit hit, and there’s nothing to do but wait.

Verdict: Best for complex, multi-file tasks. Frustrating rate limits.

Windsurf: The Underdog

Windsurf (formerly Codeium) doesn’t get enough credit.

At $15/month, it offers:

  • Decent autocomplete (not Cursor-level, but solid)
  • Cascade – an agent feature that automatically indexes your codebase
  • A usable free tier (25 credits/month)

For 80% of daily coding tasks, Windsurf gets the job done. It won’t blow your mind like Cursor’s Tab completion, but it also won’t blow your budget.

When I use it: Side projects, smaller codebases, and when I don’t want to think about credit consumption.

Verdict: Best value. If budget matters, start here.

Copilot: The Safe Choice

GitHub Copilot is the Toyota Corolla of AI coding tools. It’s reliable, affordable ($10/month), and works inside your existing IDE.

Pros:

  • Lowest friction to adopt (just install a plugin)
  • Great GitHub integration (auto PR descriptions, issue linking)
  • Decent autocomplete for common patterns

Cons:

  • Agent mode is weaker than Cursor or Claude Code
  • Less context-aware than dedicated AI editors
  • Multi-file changes often need manual guidance

When I use it: When I’m in a JetBrains IDE (where Cursor isn’t available), or when I want completions without the overhead of a new editor.

Verdict: Best entry point. You’ll probably outgrow it.

What I Actually Use Day-to-Day

Here’s my real workflow:

Morning standup -> Plan tasks -> Small edits, bug fixes -> Cursor -> Large refactoring -> Claude Code -> Side project hacking -> Windsurf -> Quick PR reviews -> Copilot

I don’t think there’s a single “best” tool. The best setup is combining tools based on what each does best.

The Uncomfortable Truth About AI Coding Tools in 2026

After 3 months, here’s what nobody talks about:

1. They’re all expensive if you use them seriously.

$20/month sounds cheap until you realize that’s the base price. Heavy usage pushes Cursor to $60+, Claude Code to $100-200. That’s $1,200-2,400/year on AI coding tools alone.

2. Rate limits are the real differentiator.

The model quality across tools is converging. What actually matters day-to-day is: can I keep working without hitting a wall? Right now, Cursor (with Auto mode) and Copilot handle this best.

3. They make you faster but not necessarily better.

I ship features 2-3x faster now. But I’ve caught myself accepting AI-generated code without fully understanding it. That’s a trap. The tools should amplify your skills, not replace your thinking.

Final Scores

Dimension Cursor Claude Code Windsurf Copilot
Autocomplete 9 N/A 8 8
Agent/Autonomy 9 10 8 7
Value for Money 7 6 9 9
Ease of Use 9 6 9 10
Ecosystem 9 7 8 9

What’s your setup? I’m curious how others are combining these tools. Drop a comment below – especially if you’ve found a workflow that works better than mine.

Stop Organizing, Start Learning: How I built an AI Study Buddy using Notion MCP

This is a submission for the Notion MCP Challenge

What I Built

Study Buddy is an intelligent orchestration layer that transforms a static Notion workspace into an active learning partner.

Managing a heavy study load often involves more “organizing” than actual “learning.” Study Buddy solves this by connecting powerful LLMs (Google Gemini & Vultr Inference models) to your Notion pages via the Model Context Protocol (MCP). It acts as a proactive agent capable of:

  • Synthesizing Knowledge: Answering questions based directly on your existing notes.
  • Active Content Generation: Automatically creating structured study guides and active-recall quizzes from scratch.
  • Multi-Channel Interaction: Accessible via a high-performance CLI for deep work or a private Telegram Bot for on-the-go learning.
  • Enterprise-Grade Security: A custom implementation of OAuth 2.0 + PKCE with Dynamic Client Registration ensures your data remains yours.

Video Demo

Show us the code

GitHub Repository: Study Buddy MCP Client

How I Used Notion MCP

I utilized the Notion MCP Server as the standardized “nervous system” of the project. Instead of hardcoding API endpoints, I built a dynamic Orchestration Loop:

  1. Reasoning: Using Google Gemini, the system interprets user intent (e.g., “Summarize my last lecture”).
  2. Tool Discovery: The client queries the MCP server to discover available capabilities (searching pages, creating content, appending blocks).
  3. Autonomous Execution: The model emits tool_calls in strict JSON. My client executes these against the MCP server, feeds the results back to the LLM, and iterates until the study task is complete.
  4. Resilient Auth: I implemented a robust OAuth 2.0 + PKCE flow. By using MCP, the client can discover resource metadata and handle token refreshes automatically, providing a seamless “plug-and-play” experience for any Notion user.

By abstracting Notion’s complexity into a ‘Zero-UI’ experience, Study Buddy handles the friction of database management and content structuring via simple chat, allowing students to spend less time ‘organizing’ and more time mastering their material.

Part 6 | Enterprise Multi-Tenancy and Resource Isolation Techniques in DolphinScheduler You Might Not Know

In Apache DolphinScheduler, multi-tenancy is not just an “auxiliary permission feature,” but the core execution model of the scheduling system. What it truly solves is not “who can use the system,” but:

Under what identity tasks run, what resources they consume, and how to prevent interference between them

Only by understanding this can we grasp the essence of DolphinScheduler’s multi-tenant design.

What Are Single-Tenant and Multi-Tenant?

First, let’s clarify what single-tenant and multi-tenant mean.

In enterprise scheduling platforms, how different teams or business units share platform resources is a fundamental design concern. Single-tenancy and multi-tenancy are two common models, with clear differences in resource isolation, stability, and scalability. Understanding these differences helps organizations choose the right architecture for efficient and controllable scheduling.

A single-tenant system serves only one team or business unit. All tasks share the same execution environment, resource pool, and permission system.

A multi-tenant system, on the other hand, allows multiple teams to share one platform. Each team is logically isolated as an independent Tenant and mapped to underlying execution identities (Linux users), resource queues (YARN queues), or cloud-native namespaces (Kubernetes namespaces), enabling independent management of tasks and resources.

Compared with single-tenancy, multi-tenancy provides significant advantages in resource isolation, stability, and scalability. While single-tenancy is simple to deploy and manage, resource contention and task interference become inevitable as the number of users grows. Multi-tenancy avoids this by clearly isolating Tenants and assigning dedicated resource pools per team or environment.

Core Mechanism: Tenant-Centric Execution Model

To overcome the limitations of single-tenancy, Apache DolphinScheduler adopts a multi-tenant design.

At the heart of this design is a single concept: Tenant.

However, a Tenant is not just a logical label—it is an execution context container. When a task is scheduled, the system determines three key aspects based on the Tenant:

1. Execution Identity

Tasks do not run abstractly on Worker nodes; they must run as a specific OS user. A Tenant is bound to a Linux user, and tasks execute under that identity, inheriting file permissions and system-level isolation.

Example: Executing tasks as a Linux user

# Switch to the Linux user corresponding to the Tenant
sudo su - team_alpha_user

# Execute workflow task
spark-submit --class com.example.Job /opt/jobs/job.jar
  • Description: Tenant is bound to an OS user, and tasks run under this identity on Worker nodes, achieving file permission and environment isolation.
  • Tip: Ensure each Tenant has an independent home directory to avoid unauthorized access.
    ### 2. Resource Ownership

When tasks are submitted to engines like Spark or Flink, they must enter a resource pool. The Tenant determines the target resource queue or namespace, ensuring controlled resource usage.

Example: Create a Tenant and bind a YARN Queue

curl -X POST http://dolphinscheduler-api:12345/tenants 
  -H "Content-Type: application/json" 
  -d '{
        "name": "team_alpha",
        "queue": "team_alpha_queue",
        "description": "Team Alpha Tenant"
      }'
  • Description: Each Tenant corresponds to a YARN Queue or K8s Namespace, ensuring exclusive resource usage.
  • Tip: After creating a Tenant, remember to configure the queue or namespace in the resource scheduling system.
    ### 3. Isolation Boundary

Tenant defines a clear boundary for data access, task execution, and resource usage, forming logical isolation between teams.

Together, these three aspects form the foundation of DolphinScheduler’s multi-tenant mechanism.

How Resource Isolation Is Achieved

Multi-tenancy alone at the scheduling layer is not enough. The key design of DolphinScheduler is mapping Tenants to real underlying resource systems.

YARN-Based Isolation

In traditional big data architectures, Tenants are mapped to YARN queues. Each Tenant corresponds to a queue with defined capacity and limits. Tasks are submitted with queue information and scheduled accordingly, preventing resource contention.

YARN Mapping Example:

Queue configuration

<queue name="team_alpha_queue">
  <capacity>30</capacity>
  <maximum-capacity>50</maximum-capacity>
  <user-limit-factor>1.0</user-limit-factor>
</queue>
  • Description: Tasks automatically enter the queue when submitted, avoiding resource conflicts between Tenants.
  • Tip: Capacity and maximum capacity can be dynamically adjusted based on team workload.

Even if one team submits a large number of tasks, it only consumes resources within its own queue.

Kubernetes-Based Isolation

In cloud-native environments, Tenants are mapped to Kubernetes namespaces. Tasks run as Pods, and:

  • ResourceQuota limits total resource usage
  • LimitRange restricts per-task resource consumption
apiVersion: v1
kind: Namespace
metadata:
  name: team-alpha
---
apiVersion: v1
kind: ResourceQuota
metadata:
  name: team-alpha-quota
  namespace: team-alpha
spec:
  hard:
    cpu: "20"
    memory: "64Gi"
    pods: "50"
  • Description: Limits total resources and number of Pods to achieve cloud-native isolation.
  • Tip: Combine with LimitRange to control per-task resource limits and prevent a single task from monopolizing resources.

This approach isolates not only resources but also runtime environments and networking.

OS-Level Isolation

At the execution layer, Linux users provide the final isolation boundary. Even on the same machine, tasks from different Tenants cannot access each other’s files or scripts.

End-to-End Execution Flow

Putting everything together, the execution flow looks like this:

  1. A workflow is triggered in DolphinScheduler
  2. The system determines the Tenant
  3. The Master assigns tasks to Workers
  4. Workers switch to the corresponding Linux user
  5. Tasks are submitted with resource metadata (YARN queue / K8s namespace)
  6. Tasks run within the assigned resource pool under defined limits


This creates full isolation from scheduling logic to resource execution.

Technical Architecture

The architecture can be understood in three layers:

  • Top Layer: DolphinScheduler (Tenant / Workflow)
  • Middle Layer: Mapping (Linux User / YARN Queue / K8s Namespace)
  • Bottom Layer: Resource systems (Compute nodes / Big data clusters / Kubernetes clusters)

The key idea is:

The scheduling layer does not directly manage resources—it controls them through Tenant mapping

Why This Design Works in Enterprises

This design becomes especially powerful in enterprise environments.

When multiple teams share a platform, resource contention is inevitable. Without Tenant-to-resource mapping, a high-load workload could impact the entire system. With proper isolation, each team operates within its own boundaries.

It also simplifies troubleshooting. Issues can be traced to a specific Tenant and then to its corresponding resource pool, without affecting the entire system.

Most importantly, the design is highly scalable. Adding new teams or integrating new compute engines only requires extending Tenant mappings, without redesigning the scheduling system.

Summary

DolphinScheduler’s multi-tenant design is essentially a way to embed the scheduling system into the resource ecosystem. Instead of relying on complex logic, it leverages operating systems, resource schedulers, and container platforms to build a stable, clear, and controllable execution model.

For engineers, the real focus is not:

“How to create a Tenant”

but rather:

“How to map Tenants to resources effectively to achieve true isolation and stability”

That is the core value of multi-tenant design.

Part 2 | The Core Abstraction Model of Apache DolphinScheduler

Part 3 | How Scheduling Actually Runs

Part 4 | The State Machine: The Real Soul of Scheduling Systems

Part 5 | What Happens When Tasks Fail? A Complete Guide to Retry and Backfill in Apache DolphinScheduler

  • Next article preview:
    Part 7 | Where Are the Performance Bottlenecks in Scheduling Platforms?

LLM Fine-Tuning: The Complete Guide to Customizing Language Models (2026)

Every enterprise asking about LLM fine-tuning has the same question: “Should we fine-tune, use RAG, or just improve our prompts?” The answer depends on your task, data, budget, latency requirements, and security posture. Yet no guide on Google provides a clear decision framework — Unsloth sells its tool, Lakera sells security, DataCamp sells courses.

This guide synthesizes the technical depth of Unsloth, the security perspective of Lakera, and the academic rigor of the arXiv comprehensive survey — with an enterprise decision framework and cost analysis that none of them provide.

What Is Fine-Tuning? And Why It Matters for Enterprises

LLM fine-tuning language models 2026

LLM fine-tuning is the process of taking a pre-trained language model and re-training it on domain-specific data to customize its behavior. It’s a subset of transfer learning: you leverage the model’s existing knowledge and adapt it to your use case.

Pre-training Fine-tuning
Trains from scratch on trillions of tokens Adapts an already-trained model
Requires thousands of GPUs for weeks Can be done on 1 GPU in hours
Cost: millions of dollars Cost: $10-$10,000 (depends on size)
General knowledge Domain-specific knowledge
Done by OpenAI, Meta, Google Can be done by any enterprise

Why it matters now: enterprises are paying $16-21 CPC for fine-tuning expertise — among the highest CPCs in the entire AI keyword space. The demand is real, the expertise is scarce.

Fine-Tuning vs RAG vs Prompting: The Decision Framework

The framework no competitor provides:

Criterion Prompting RAG Fine-tuning
When to use Generic tasks, experimentation Frequently changing knowledge Specific, stable behavior
Data needed None Documents / knowledge base Hundreds to thousands of input-output pairs
Initial cost $0 (API) $500-5,000 (vector infra) $10-10,000 (GPU)
Recurring cost High (tokens per call) Medium (hosting + API) Low (local model hosting)
Latency Variable (API) Higher (search + generation) Lower (optimized local model)
Data privacy Data goes to cloud Documents on your server Data stays on your server
Update speed Instant (change prompt) Fast (update documents) Slow (re-train)
Customization Low-medium Medium High
Best for Prototypes, exploration Support, FAQs, documentation Tone, format, specialized tasks

Practical rule:

  • Need the model to know updated information? → RAG
  • Need the model to behave a specific way? → Fine-tuning
  • Need both? → RAG + fine-tuning (the most powerful combination)

Unsloth’s controversial claim: Fine-tuning can replicate ALL RAG capabilities. This is technically possible (train the model on your documents) but impractical for most enterprises — knowledge changes frequently, and re-training is slower than updating a RAG index. The claim holds for static, specialized knowledge; it fails for dynamic, frequently updated content.

Fine-Tuning Methods in 2026

Core Methods

Method Complexity GPU Required What It Does
SFT (Supervised Fine-Tuning) Low Medium-high Trains on curated input-output pairs
LoRA (Low-Rank Adaptation) Low-medium Low (10-100x less VRAM) Trains only adapter layers — 1% of weights
QLoRA (Quantized LoRA) Medium Very low (3GB minimum) 4-bit quantization + LoRA — 65B+ on consumer GPU
PEFT Low-medium Low HuggingFace library: LoRA, prefix-tuning, prompt-tuning

Alignment Methods

Method Complexity What It Does
RLHF (Reinforcement Learning from Human Feedback) High Trains reward model from human preferences, then optimizes LLM
DPO (Direct Preference Optimization) Medium Simpler RLHF — no reward model needed, direct preference learning
GRPO (Group Relative Policy Optimization) Medium DeepSeek’s method — groups samples for more efficient optimization
ORPO (Odds Ratio Preference Optimization) Medium Combines SFT and alignment in a single training step

LoRA is the breakthrough that democratized fine-tuning: by training only 1% of model weights, it reduces GPU/VRAM needs by 10-100x. QLoRA takes it further — quantizing to 4 bits enables fine-tuning 65B+ parameter models on a single consumer GPU with just 3GB VRAM (Unsloth).

Choosing a Model for Fine-Tuning (2026)

Model Sizes License Differentiator Fine-tuning Score
Llama 3.x (Meta) 8B, 70B, 405B Open (with restrictions) Best ecosystem (HuggingFace) ✓✓✓
Mistral 7B, 8x7B (Mixtral), Large Apache 2.0 / commercial Best quality/parameter ratio ✓✓✓
DeepSeek-R1 7B, 67B, V3 MIT Strong reasoning and code ✓✓ (Chinese character risk)
Qwen 2.5 (Alibaba) 7B, 14B, 72B Apache 2.0 Strong multilingual, math ✓✓
Gemma 2 (Google) 2B, 9B Permissive Light, ideal for edge/mobile ✓✓
Phi-3/4 (Microsoft) 3B, 14B MIT Ultra-light, surprising quality ✓✓

Real-world experience: DeepSeek failed (generated Chinese characters), Llama failed, Mistral 7B succeeded in a practical fine-tuning project. Lesson: always test 2-3 models before committing.

Fine-Tuning Tools and Frameworks

Framework Speed Ease of Use Differentiator
Unsloth 2x faster than baseline Medium Fastest LoRA/QLoRA; Studio for no-code
HuggingFace Transformers Baseline High Largest ecosystem, most tutorials
Axolotl Fast Medium YAML config, multi-method support
LitGPT Fast Medium Lightning AI, clean API
torchtune Fast Medium Meta’s official, PyTorch-native
Google Vertex AI N/A (managed) High Enterprise-grade, fully managed

How Much Does Fine-Tuning Cost?

Approach Initial Cost Monthly Cost Privacy Customization
API (GPT-4, Claude) $0 $500-5,000+ (tokens) Data goes to cloud Low (prompt only)
RAG + API $500-3,000 $300-2,000 (API + hosting) Documents local Medium
Fine-tuning (7B, LoRA) $10-100 (GPU) $50-200 (model hosting) 100% on-premise High
Fine-tuning (70B, QLoRA) $50-500 (GPU) $200-1,000 (hosting) 100% on-premise Very high
Fine-tuning + RAG $500-3,000 $200-1,000 Hybrid configurable Maximum

Where to train:

Platform GPU Cost Best For
Google Colab T4 (15GB) Free Experimentation
Kaggle P100/T4 Free (30h/week) 7B model fine-tuning
Lambda Labs A100 (80GB) $1.10/hr Serious fine-tuning
RunPod A100, H100 From $0.39/hr Production
Vast.ai Variable From $0.10/hr Minimum budget

Security Risks: Data Poisoning, Prompt Injection, and Model Extraction

Lakera highlights critical security concerns that most fine-tuning guides ignore:

Risk Description Mitigation
Data poisoning Malicious data in training set corrupts model behavior Data validation, provenance tracking
Prompt injection Fine-tuned models remain vulnerable to adversarial prompts Input sanitization, Lakera Guard
Model extraction Attackers reconstruct your fine-tuned model via API queries Rate limiting, output filtering
Training data leakage Model memorizes and reveals sensitive training data Differential privacy, data deduplication
Backdoor attacks Hidden triggers in training data activate malicious behavior Adversarial testing, red teaming

Dropbox uses Lakera Guard for LLM security with their fine-tuned models. If you’re fine-tuning with proprietary or sensitive data, security isn’t optional — it’s foundational.

Fine-Tuning for Blockchain and Web3

At Beltsys, we apply LLM fine-tuning for Web3 use cases:

  • Models trained on Solidity for smart contract generation and auditing
  • LLMs specialized in ERC-3643, ERC-4337 documentation and tokenization standards
  • RAG + fine-tuned chatbots for Web3 platform technical support
  • Fine-tuned agents for on-chain transaction analysis and DeFi protocol interaction

The combination of fine-tuning + RAG is ideal for fintechs and blockchain companies that need models speaking their technical language with current data. Blockchain & AI consulting.

EU AI Act and Fine-Tuned Models

The EU AI Act raises an unresolved question: is a fine-tuned model a “new” AI system?

  • Substantial behavior modification → may classify as new system → mandatory compliance
  • Minor adaptation (tone/format) → probably not
  • Recommendation: Document the fine-tuning process, training data, and evaluations. If your model makes decisions in healthcare, finance, or hiring, assume you need compliance.
  • Deadline: August 2, 2026. Penalties: up to €35M or 7% of global revenue.

Frequently Asked Questions About LLM Fine-Tuning

What is LLM fine-tuning?

LLM fine-tuning is the process of re-training a pre-trained language model with domain-specific data to customize its behavior. It’s a subset of transfer learning — you leverage existing knowledge and adapt it to your use case. Key techniques include LoRA (trains 1% of weights), QLoRA (4-bit quantization for consumer GPUs), and DPO (alignment without reward model).

When should I fine-tune vs use RAG?

Fine-tune when you need the model to behave a specific way (tone, format, specialized responses). Use RAG when you need the model to know updated information (documentation, FAQs). Use both for maximum customization with current knowledge. Fine-tuning is better for static, specialized knowledge; RAG for dynamic content.

How much does LLM fine-tuning cost?

A 7B model with LoRA: $10-100 in GPU costs (2-4 hours). A 70B model with QLoRA: $50-500. Monthly hosting: $50-1,000 depending on model size. Free options: Google Colab, Kaggle (30h/week GPU). Compared to API costs ($500-5,000+/month), fine-tuning is cheaper long-term and keeps data on-premise.

What is LoRA and why does it matter?

LoRA (Low-Rank Adaptation) trains only adapter layers — approximately 1% of model weights — reducing GPU/VRAM requirements by 10-100x. QLoRA adds 4-bit quantization, enabling fine-tuning of 65B+ parameter models on a single consumer GPU with just 3GB VRAM. These techniques democratized fine-tuning for enterprises of all sizes.

Is fine-tuning secure?

Not automatically. Lakera warns that fine-tuned models remain vulnerable to prompt injection, data poisoning, training data leakage, and model extraction attacks. Dropbox uses Lakera Guard for LLM security. If fine-tuning with proprietary data: implement data validation, differential privacy, input sanitization, and adversarial testing.

Does the EU AI Act apply to fine-tuned models?

Potentially. If fine-tuning substantially modifies model behavior, it may create a “new” AI system requiring compliance. For models making decisions in healthcare, finance, or hiring, assume compliance is needed. Document training data, process, and evaluations. Deadline: August 2, 2026. Penalties: €35M or 7% revenue.

About the Author

Beltsys is a Spanish blockchain and AI development company specializing in LLM fine-tuning for Web3, smart contracts, and fintech solutions. With extensive experience across more than 300 projects since 2016, Beltsys implements custom models with RAG and fine-tuning for enterprises that need AI speaking their technical language. Learn more about Beltsys

Related: Smart Contract Development
Related: Web3 Development
Related: Blockchain Consulting
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From Apache SeaTunnel to ASF Member: A Story of Long-Term Commitment

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Recently, after internal discussions, the Apache Software Foundation invited several PMC Members from the Apache SeaTunnel project to become ASF Members—one of the highest honors within the foundation. Among them is Wang Hailin.

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Congratulations to @wang Hailin on becoming an ASF Member! As a key contributor to the SeaTunnel community, this recognition is not only a personal milestone, but also a moment of pride for the entire community.

Over the years, he has remained deeply involved in the community: from refining documentation to improving code, from participating in technical discussions to helping newcomers. His contributions can be seen across almost every corner of the project. Beyond SeaTunnel, he has also been actively contributing to multiple ASF projects, consistently practicing the Apache Way advocated by the foundation. It is this steady, long-term dedication that has led to this important recognition.

To mark the occasion, the community conducted an in-depth interview with him. This article is structured into five sections—personal background, open-source journey, the path to ASF Member, SeaTunnel community development, and open-source culture—to give a closer look at his growth, his experiences in open source, and the passion and persistence behind his contributions.

Personal Background & Open Source Journey

王海林

Q1: Could you briefly introduce yourself and how you got into big data and open source?

A: Hey guys, I’m Wang Hailin, and my GitHub ID is hailin0. I mainly work on data infrastructure, with a focus on data integration, data synchronization, and data platforms.

Outside of work, I enjoy engaging with open-source communities—sharing practical experience and exchanging ideas around data platforms and integration technologies.

My entry into big data and open source is closely tied to my earlier work experience. While working on systems like data development platforms and performance monitoring, I frequently dealt with data ingestion and synchronization challenges, which required exploring various data integration tools.

That’s when I came across SeaTunnel. What stood out to me was its extensible architecture—it supports a wide range of data sources and complex synchronization scenarios, making it well-suited for enterprise use. This sparked my interest, and I gradually started contributing to the community. Over time, through continuous contributions and discussions, I became one of the core contributors.

Q2: When did you start contributing to SeaTunnel, and what was the trigger?

A: It started from a practical need at work. At the time, I was building a data platform and needed a reliable data integration tool. During that evaluation process, I discovered SeaTunnel.

Back then, the project wasn’t as mature as it is today, but its architecture left a strong impression on me—especially the plugin-based Connector system and the flexible data synchronization model.

I began using SeaTunnel in real-world scenarios, and gradually got involved in contributing. Starting with small fixes and bug patches, I later participated in more feature development and community discussions, eventually becoming a long-term contributor.

Q3: What key areas or features have you contributed to in SeaTunnel?

A: My contributions mainly fall into a few areas.

Early on, I worked on Connector development and improvements. For a data integration platform, the Connector ecosystem is fundamental—it determines which data sources and systems the platform can connect to.

As I became more involved, I also contributed to framework-level and infrastructure work, such as improving the E2E testing system and refining the logging framework to make the project more robust and standardized.

Later, as I gained a deeper understanding of the synchronization engine, I started working on CDC (Change Data Capture) capabilities, including CDC read/write and DDL synchronization. In real production environments, schema changes (DDL) are unavoidable. If a system cannot handle schema evolution properly, data pipelines can easily break.

Overall, these efforts are driven by a single goal: to make SeaTunnel not just a data synchronization tool, but a reliable data integration infrastructure for enterprise environments.

Open Source Contributions & Growth

Q4: Which contribution or experience left the deepest impression on you?

A: One experience that stands out is working on DDL support in CDC scenarios.

At first glance, DDL may seem like a simple SQL parsing problem. But in a data synchronization system, it must flow correctly through the entire pipeline: from Source capturing the event, to passing it through the data stream, to executing schema changes on the Sink.

The real challenge lies in maintaining consistency between DDL and data changes. In practice, synchronization jobs run concurrently across multiple nodes, so DDL events must maintain a consistent order throughout the distributed pipeline.

This requires tight integration with state management mechanisms like Checkpoint and Savepoint, ensuring that after recovery or restart, DDL and data events remain in the correct order.

When you combine all these factors, DDL handling becomes a system-level challenge involving distributed data flow, state consistency, and multi-system compatibility.

This work took quite a long time and involved extensive discussions with other contributors. It’s one of the more complex aspects of many data synchronization systems, and we aimed to make SeaTunnel more reliable for enterprise real-time scenarios.

Q5: What do you think is the most important skill in open source collaboration?

A: I would say communication and collaboration are critical.

Technical skills are the foundation, but many decisions in open source are made through discussion and consensus. Being able to clearly express your ideas, understand others’ perspectives, and move toward agreement is essential.

Another important factor is patience and long-term commitment. Open source is not a short-term effort—it requires sustained involvement.

Q6: What advice would you give to newcomers in open source?

A: Start small. For example:

  • Fix a bug
  • Improve documentation
  • Submit a small feature enhancement

This helps you get familiar with the codebase and development workflow.

Also, participate in discussions. Even asking questions or joining simple conversations helps you understand the project’s design.

Open source is a long journey—you don’t need to aim for big features at the beginning. What matters more is understanding the architecture, not just the code.

Many core contributors grow over years—from users to contributors, and eventually to maintainers.

For me, the biggest gain from open source is not a specific piece of code, but the opportunity to collaborate with developers from different companies and backgrounds. That experience is incredibly valuable.

Becoming an ASF Member

Q7: What was your first reaction when you were invited to become an ASF Member?

A: I was surprised and very grateful.

ASF Membership is not something you apply for—it comes through nomination and voting by existing members. So it represents recognition from the community for long-term contributions.

Q8: How closely is this achievement tied to your work in SeaTunnel?

A: Very closely.

The SeaTunnel community gave me many opportunities to grow—from contributing code to participating in community governance. Through this process, I gradually learned how Apache communities operate.

It’s not just about technical contributions, but also collaboration and governance, which are all important factors in becoming an ASF Member.

Q9: What does becoming an ASF Member mean to you?

A: To me, it represents responsibility.

It’s not only recognition of past contributions, but also a commitment to continue contributing to the Apache community—helping projects grow, supporting new projects entering the ecosystem, and promoting open-source culture.

Q10: How do you see the importance of the Apache Way?

A: The Apache community emphasizes “Community Over Code.”

A successful project needs not only strong technology, but also a healthy community, including:

  • Open and transparent decision-making
  • Consensus-driven governance
  • Encouraging participation from diverse contributors
  • Continuously welcoming new contributors

These are key reasons why Apache projects can succeed in the long run.

SeaTunnel Community Development

Q11: What are the key milestones in SeaTunnel’s growth?

A: Several milestones stand out:

  • Entering the Apache Incubator
  • Unifying APIs and introducing the Zeta engine
  • Graduating as a Top-Level Project (TLP)
  • Rapid iteration in the 2.3.x series with increasing stability

SeaTunnel was open-sourced in 2017, entered the Apache Incubator in 2021, and became a TLP in 2023. This journey reflects not only technical evolution but also the maturation of community governance.

Q12: How do you see SeaTunnel’s positioning in data integration?

A: In recent years, the demand for efficient data movement has grown significantly, and synchronization scenarios have become more complex.

SeaTunnel aims to be a high-performance, extensible platform that supports diverse data integration needs across different use cases.

It already supports multiple data sources, batch processing, real-time synchronization, and CDC.

Looking ahead, I believe it will continue to evolve in areas such as:

  • Expanding the connector ecosystem
  • Strengthening data transformation capabilities
  • Improving fault handling
  • Enhancing ecosystem integration

Open Source Culture & Personal Growth

Q13: How has open source influenced your career?

A: It has influenced me in two major ways.

First, it broadened my technical perspective. In company projects, decisions are often driven by specific business needs. In open source, designs must work across different use cases, systems, and organizations. This leads to a more comprehensive understanding of system design.

Second, it deepened my understanding of software engineering and collaboration. In open source, a feature goes through idea proposal, design discussion, review, and iteration before merging. This process emphasizes design and communication, not just coding.

Working with developers from different countries and backgrounds also brings fresh perspectives.

For me, the biggest gain is the opportunity to collaborate in an open environment and solve problems with talented engineers.

Q14: How would you summarize the spirit of open source in one sentence?

A: Based on my experience, the most valuable aspect of open source is that it provides a space for long-term participation and growth.

I started as a user, using tools to solve problems. Then I began contributing small fixes, and gradually got involved in feature development and core system design.

Looking back, it’s a journey from user → contributor → maintainer.

In a company, knowledge often stays within a team. In open source, your work can be seen, used, and improved by many others. As the project grows, so do the people involved.

So if I had to summarize it in one sentence:

Open source is not just about sharing code—it’s about growing together with the community.

How to Build an Earnings Call Transcript Analyzer

How to Build an Earnings Call Transcript Analyzer

Earnings calls contain signals that move stock prices — hedging language, forward guidance changes, and sentiment shifts. Most investors read transcripts manually. We’ll build a Python tool that scrapes transcripts and extracts actionable signals automatically.

The Value of Automated Transcript Analysis

When a CEO shifts from “we expect strong growth” to “we anticipate headwinds,” that language change predicts stock movement. NLP can detect these shifts across hundreds of companies simultaneously — something no human analyst can do.

Scraping Earnings Transcripts

Several sites publish free earnings call transcripts. We’ll build a scraper that collects them systematically using ScraperAPI for reliable proxy rotation:

import requests
from bs4 import BeautifulSoup
import re

SCRAPER_API_KEY = "YOUR_KEY"

def scrape_transcript(url):
    response = requests.get(
        "http://api.scraperapi.com",
        params={
            "api_key": SCRAPER_API_KEY,
            "url": url,
            "render": "true"
        },
        timeout=60
    )
    soup = BeautifulSoup(response.text, "html.parser")
    segments = []
    current_speaker = None
    current_text = []
    current_role = ""

    for element in soup.find_all(["p", "strong", "b"]):
        text = element.get_text(strip=True)
        speaker_match = re.match(r"^([A-Z][a-z]+ [A-Z][a-z]+)s*[-u2014]s*(.+)", text)
        if speaker_match:
            if current_speaker:
                segments.append({
                    "speaker": current_speaker,
                    "role": current_role,
                    "text": " ".join(current_text)
                })
            current_speaker = speaker_match.group(1)
            current_role = speaker_match.group(2)
            current_text = []
        elif current_speaker:
            current_text.append(text)
    return segments

Sentiment Analysis Engine

We analyze sentiment at the sentence level to catch nuanced shifts:

from collections import Counter
import re

POSITIVE_TERMS = {
    "growth", "exceeded", "strong", "record", "confident",
    "momentum", "opportunity", "upside", "robust", "accelerating",
    "outperformed", "beat", "raised", "guidance", "optimistic"
}

NEGATIVE_TERMS = {
    "headwinds", "challenging", "decline", "pressure", "uncertainty",
    "cautious", "softness", "deceleration", "missed", "below",
    "restructuring", "impairment", "risk", "concern", "weakness"
}

HEDGING_TERMS = {
    "may", "might", "could", "potentially", "possibly",
    "approximately", "somewhat", "relatively", "generally"
}

def analyze_segment(segment):
    words = set(re.findall(r'bw+b', segment["text"].lower()))
    pos_count = len(words & POSITIVE_TERMS)
    neg_count = len(words & NEGATIVE_TERMS)
    hedge_count = len(words & HEDGING_TERMS)
    total = pos_count + neg_count or 1
    sentiment_score = (pos_count - neg_count) / total

    return {
        "speaker": segment["speaker"],
        "role": segment["role"],
        "sentiment": sentiment_score,
        "hedging_ratio": hedge_count / max(len(words), 1),
        "positive_terms": list(words & POSITIVE_TERMS),
        "negative_terms": list(words & NEGATIVE_TERMS),
        "word_count": len(words)
    }

Forward Guidance Detection

Extract and compare forward-looking statements:

def extract_guidance(segments):
    guidance_patterns = [
        r"(?:we expect|we anticipate|we project|we forecast|guidance).{10,200}",
        r"(?:next quarter|full year|fiscal year).{10,200}",
        r"(?:revenue.{0,30}(?:between|range|expect)|eps.{0,30}(?:between|range|expect)).{10,100}",
    ]
    guidance_statements = []
    for segment in segments:
        if segment.get("role", "").lower() in ["ceo", "cfo", "chief executive", "chief financial"]:
            for pattern in guidance_patterns:
                matches = re.findall(pattern, segment["text"].lower())
                for match in matches:
                    guidance_statements.append({
                        "speaker": segment["speaker"],
                        "role": segment["role"],
                        "statement": match.strip(),
                        "type": "forward_guidance"
                    })
    return guidance_statements

Quarter-over-Quarter Comparison

The real value emerges when you compare transcripts across quarters:

def compare_quarters(current_analysis, previous_analysis):
    changes = {}
    for speaker in set(a["speaker"] for a in current_analysis):
        curr = [a for a in current_analysis if a["speaker"] == speaker]
        prev = [a for a in previous_analysis if a["speaker"] == speaker]
        if curr and prev:
            sentiment_shift = curr[0]["sentiment"] - prev[0]["sentiment"]
            hedging_shift = curr[0]["hedging_ratio"] - prev[0]["hedging_ratio"]
            changes[speaker] = {
                "sentiment_change": round(sentiment_shift, 3),
                "hedging_change": round(hedging_shift, 3),
                "signal": (
                    "BEARISH" if sentiment_shift < -0.2 or hedging_shift > 0.05
                    else "BULLISH" if sentiment_shift > 0.2
                    else "NEUTRAL"
                )
            }
    return changes

Scaling the Analysis

To analyze hundreds of earnings calls per quarter, you need robust proxy infrastructure. ThorData provides residential proxies for scraping financial sites, and ScrapeOps monitors scraper performance across sources.

Putting It All Together

def full_analysis_pipeline(transcript_url):
    segments = scrape_transcript(transcript_url)
    analysis = [analyze_segment(s) for s in segments]
    guidance = extract_guidance(segments)
    ceo_sentiment = [a for a in analysis if "ceo" in a["role"].lower()]
    overall = sum(a["sentiment"] for a in analysis) / len(analysis) if analysis else 0
    return {
        "overall_sentiment": round(overall, 3),
        "ceo_sentiment": ceo_sentiment,
        "guidance_statements": guidance,
        "segment_count": len(segments)
    }

Key Insights

  • Hedging increases in the Q&A section often predict earnings misses next quarter
  • CEO vs CFO sentiment divergence can signal internal disagreements about outlook
  • Word count changes (shorter answers) sometimes indicate discomfort with a topic

Build this analyzer, run it on historical transcripts, and backtest against stock performance. The patterns are real and exploitable.

I Stopped Dreading LaTeX Error Logs — Here’s What Changed

Let me describe a scene every LaTeX user has lived:

It’s 11pm. You’ve been writing all day. You hit compile, walk away to make tea, come back to find this in the log:

! Package inputenc Error: Unicode character 的 (U+7684)
(inputenc)                not set up for use with LaTeX.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...
l.1847 ...rithm based on the work of Li et al. 的

?

And you just stare at it. You didn’t even type a Chinese character. Where did that come from? Is it in a bibliography entry? A comment someone else left? A package that auto-inserted something?

This is the specific kind of LaTeX suffering that has no good solution — until recently.

The problem with current LaTeX debugging tools

When your compile log hits 400 lines, the challenge isn’t understanding individual error messages. It’s triage — figuring out which errors are root causes and which ones are just cascading side effects of a single upstream problem.

I used to do this manually. Open the log. Search for !. Copy the error. Google it. Read StackOverflow answers that almost match my situation. Try a fix. Recompile. Different error. Repeat.

Calling ChatGPT helps a little. But here’s the issue: ChatGPT doesn’t know your codebase. You paste a snippet, it gives you a generic answer. It doesn’t know what packages you’ve loaded, what custom commands you’ve defined, or what your root file structure looks like. So you get answers like “make sure amsmath is loaded” when you already have amsmath loaded and the real problem is something three files upstream.

What TeX64’s Axiom does differently

TeX64 is a local-first LaTeX editor for macOS. Its AI assistant, Axiom, has access to your entire project — all .tex files, your actual compile log, and your BibTeX. Not a snippet you pasted. The whole thing.

This changes the quality of the answers dramatically.

Here’s a real example. I had a project with 23 errors in the log. I typed “analyze these errors” into Axiom’s chat. The response:

“You have 23 errors but they stem from 3 root causes:

Root cause 1 (generates 18 errors): macros.tex line 34 defines proof using newcommand, but the amsthm package already defines a proof environment. This causes a naming conflict that cascades throughout the document.

Root cause 2 (generates 4 errors): chapter4.tex line 209 has a begin{table} with no matching end{table} — LaTeX loses track of the environment and the errors pile up from there.

Root cause 3 (1 error): bibliography.bib entry Zhang2019 has a { in the title field that’s not closed.

I’ll show diffs for each fix. Want to start with root cause 1?”

That analysis would have taken me an hour of manual log reading. It took Axiom about 20 seconds.

The diff-before-apply approach

One thing Axiom does that I deeply appreciate: it shows you exactly what it wants to change before changing anything.

Every suggestion comes with a diff:

  % macros.tex, line 34
- newcommand{proof}[1]{textit{Proof.} #1 qed}
+ newcommand{myproof}[1]{textit{Proof.} #1 qed}

And then: “Apply this change?”

You see what’s happening, you understand why, and you decide. Axiom never silently edits your files. For a thesis or paper where every word matters, this is the right way to work with AI.

Other things I’ve used it for

Once I started using TeX64, I found Axiom useful for things beyond error fixing:

Generating math I don’t remember the syntax for: I can describe a formula in plain English — “the limit as n approaches infinity of the sum from k=1 to n of 1/k^2” — and get clean LaTeX back. No more digging through the LaTeX math symbol list.

Literature: paste title, get BibTeX: Tell Axiom you want to cite a paper, it searches arXiv and drops the BibTeX entry into your .bib file. This alone has saved me probably 20 minutes per writing session.

Package conflict diagnosis: When adding packages to a big project causes mysterious new errors, Axiom can spot ordering conflicts. “You’re loading cleveref before hyperref — switch the order.”

Honest limitations

TeX64 is macOS only. If you’re on Windows or Linux, this isn’t for you.

You need MacTeX or TeX Live installed separately — TeX64 is the editor, not a LaTeX distribution. The app’s environment diagnostics will walk you through setup if you don’t have it already.

AI features require internet. Compilation itself is fully local and offline-capable. On my M2 MacBook Air, a 120-page document compiles in about 8 seconds — no internet bottleneck on the compile step.

There’s a free tier to start with. If you end up using Axiom heavily, there are paid plans.

The thing that surprised me most

I expected Axiom to be useful. What I didn’t expect was how much it changed my relationship with errors.

Before: compile error → dread → 45-minute debugging session.

After: compile error → “let Axiom look at this” → usually fixed in under 5 minutes.

The psychological difference is real. When you’re not scared of errors, you compile more often. When you compile more often, you catch problems earlier. It’s a virtuous loop that actually makes you write more.

If you’re on a Mac and spend meaningful time in LaTeX, it’s worth trying.

→ tex64.com

Google’s Cache Compression, Siri’s Open Door, and the CFO Agent Test

Google’s Cache Compression, Siri’s Open Door, and the CFO Agent Test

Google slashes AI memory needs by 6x while Apple opens Siri to rivals, and a new AI-focused language arrives as LLM agents face their first CFO benchmark.

Google’s TurboQuant reduces AI LLM cache memory capacity requirements by at least six times — up to 8x performance boost on Nvidia H100 GPUs, compresses KV caches to 3 bits with no accuracy loss – Tom

What happened:

Google’s TurboQuant cuts LLM cache memory requirements by at least six times, achieving up to 8x performance gains on Nvidia H100 GPUs by compressing KV caches to just 3 bits without accuracy loss.

Why it matters:

This breakthrough directly addresses the memory bottleneck that limits LLM inference speed and scale, potentially enabling larger models to run on existing hardware or dramatically reducing infrastructure costs for AI services.

Context:

KV cache compression has been a key focus area as models grow larger and inference costs become prohibitive for many applications.

Apple Plans to Open Up Siri to Rival AI Assistants in iOS 27 Update

What happened:

Apple plans to allow Siri to integrate with competing AI assistants beyond ChatGPT in the upcoming iOS 27 update, according to Bloomberg.

Why it matters:

This marks a significant shift from Apple’s traditionally closed ecosystem, potentially giving developers and users more flexibility while forcing Apple to compete on AI quality rather than lock-in.

Context:

The move comes as Apple faces pressure to keep pace with rapidly advancing AI capabilities from competitors like OpenAI and Google.

Aria – A programming language specifically for AI code generation

What happened:

Aria is a new programming language designed specifically for AI code generation, with its website and documentation now available online.

Why it matters:

Purpose-built languages for AI development could streamline workflows and reduce the friction between human intent and machine-generated code, potentially becoming a standard tool for AI-assisted programming.

Context:

As AI coding tools mature, specialized languages may emerge to bridge the gap between natural language prompts and executable code.

OpenAI Backs Isara, New AI Startup Seeking Bot Army Breakthroughs

What happened:

OpenAI has backed Isara, a new AI startup focused on developing breakthroughs for bot army technology, according to the Wall Street Journal.

Why it matters:

This investment signals OpenAI’s interest in scaling AI agents beyond single-task assistants toward coordinated multi-agent systems, which could transform everything from customer service to software testing.

Context:

The “bot army” concept represents the next frontier in agentic AI, where multiple specialized agents work together autonomously.

Software Engineer Interviews for the Age of AI

What happened:

A blog post explores how software engineer interviews should evolve in the age of AI, with discussion on Hacker News.

Why it matters:

As AI tools become ubiquitous in development, traditional coding interviews may need to test problem-solving and system design skills rather than memorization or manual coding speed.

Context:

Companies are grappling with how to evaluate engineers when AI can handle much of the routine coding work.

Can LLM Agents Be CFOs? A Benchmark for Resource Allocation in Dynamic Enterprise Environments

What happened:

Researchers have created a benchmark testing whether LLM agents can handle CFO-level resource allocation decisions in dynamic enterprise environments, addressing uncertainty and competing objectives.

Why it matters:

This benchmark tackles one of AI’s biggest challenges: making strategic, long-term decisions with incomplete information—a capability that could transform business operations if achieved.

Context:

While LLMs excel at reactive tasks, complex resource allocation requires planning and trade-offs that remain difficult for current AI systems.

Sources: Google News AI, Hacker News AI, Arxiv AI

Building a Real Estate Foreclosure Tracker with Public Records

Building a Real Estate Foreclosure Tracker with Public Records

Foreclosure data is public information in the United States, but it’s scattered across county clerk websites, court systems, and government databases. Investors, researchers, and journalists who can aggregate this data gain a significant informational advantage. Let’s build a Python-based foreclosure tracker.

Why Track Foreclosures?

Foreclosure filings are leading indicators of economic stress in specific markets. They help real estate investors find below-market properties, help journalists investigate predatory lending, and help researchers study housing market dynamics.

Data Sources

Foreclosure data comes from several public sources:

  • County clerk/recorder websites — Notice of Default, Lis Pendens filings
  • HUD foreclosure listings — government-owned properties
  • Court records — judicial foreclosure proceedings
  • Census/ACS data — demographic context

HUD Foreclosure Listings Scraper

import requests
from bs4 import BeautifulSoup
import re

SCRAPER_API_KEY = "YOUR_KEY"

class HUDForeclosureScraper:
    BASE_URL = "https://www.hudhomestore.gov"

    def search_properties(self, state, city=None, zip_code=None):
        search_url = f"{self.BASE_URL}/Listing/PropertySearchResult"
        form_data = {
            "State": state,
            "City": city or "",
            "Zip": zip_code or "",
            "PropertyType": "ALL",
            "ListingStatus": "Available"
        }
        response = requests.post(
            "http://api.scraperapi.com",
            params={"api_key": SCRAPER_API_KEY, "url": search_url, "render": "true"},
            data=form_data,
            timeout=60
        )
        return self._parse_listings(response.text)

    def _parse_listings(self, html):
        soup = BeautifulSoup(html, "html.parser")
        properties = []
        for listing in soup.select(".property-listing, .listing-row, tr"):
            address = listing.select_one(".address, td:nth-child(1)")
            price = listing.select_one(".price, td:nth-child(3)")
            status = listing.select_one(".status, td:nth-child(4)")
            if address:
                properties.append({
                    "address": address.get_text(strip=True),
                    "price": price.get_text(strip=True) if price else "N/A",
                    "status": status.get_text(strip=True) if status else "N/A"
                })
        return properties

County Records Scraper

class CountyRecordsScraper:
    def __init__(self, scraper_api_key):
        self.api_key = scraper_api_key

    def scrape_county_records(self, county_url, search_params):
        response = requests.get(
            "http://api.scraperapi.com",
            params={"api_key": self.api_key, "url": county_url, "render": "true"},
            timeout=60
        )
        soup = BeautifulSoup(response.text, "html.parser")
        filings = []
        tables = soup.find_all("table")
        for table in tables:
            rows = table.find_all("tr")
            for row in rows[1:]:
                cells = row.find_all("td")
                if len(cells) >= 4:
                    filing = {
                        "case_number": cells[0].get_text(strip=True),
                        "filing_date": cells[1].get_text(strip=True),
                        "document_type": cells[2].get_text(strip=True),
                        "property_address": cells[3].get_text(strip=True)
                    }
                    foreclosure_types = [
                        "notice of default", "lis pendens",
                        "notice of sale", "foreclosure"
                    ]
                    if any(ft in filing["document_type"].lower() for ft in foreclosure_types):
                        filings.append(filing)
        return filings

Geocoding and Market Analysis

import time

def geocode_address(address):
    response = requests.get(
        "https://nominatim.openstreetmap.org/search",
        params={"q": address, "format": "json", "limit": 1},
        headers={"User-Agent": "ForeclosureTracker/1.0"}
    )
    time.sleep(1)
    results = response.json()
    if results:
        return {
            "lat": float(results[0]["lat"]),
            "lon": float(results[0]["lon"]),
            "display_name": results[0]["display_name"]
        }
    return None

def market_concentration(properties):
    from collections import Counter
    zips = []
    for prop in properties:
        zip_match = re.search(r'b(d{5})b', prop.get("address", ""))
        if zip_match:
            zips.append(zip_match.group(1))
    concentration = Counter(zips).most_common(20)
    return [{"zip": z, "count": c} for z, c in concentration]

Building the Pipeline

import pandas as pd
from datetime import datetime

class ForeclosureTracker:
    def __init__(self, api_key):
        self.hud = HUDForeclosureScraper()
        self.county = CountyRecordsScraper(api_key)

    def daily_scan(self, states, county_urls):
        all_properties = []
        for state in states:
            properties = self.hud.search_properties(state)
            for p in properties:
                p["source"] = "HUD"
                p["state"] = state
            all_properties.extend(properties)
        for url in county_urls:
            filings = self.county.scrape_county_records(url, {})
            for f in filings:
                f["source"] = "County"
            all_properties.extend(filings)
        df = pd.DataFrame(all_properties)
        df["scan_date"] = datetime.now().isoformat()
        filename = f"foreclosures_{datetime.now():%Y%m%d}.csv"
        df.to_csv(filename, index=False)
        print(f"Found {len(all_properties)} properties across {len(states)} states")
        return df

Scaling Across Counties

With over 3,000 counties in the US, scaling requires solid proxy infrastructure. ScraperAPI handles JavaScript rendering for modern county sites. ThorData residential proxies prevent IP blocks during large scans. ScrapeOps tracks success rates per county.

Legal Considerations

All data scraped here is public record. However, respect rate limits, comply with each site’s terms of service, and avoid overloading government infrastructure. This tool is designed for legitimate research, journalism, and investment analysis.

Track foreclosures systematically and you’ll see market shifts before they appear in the headlines.

How to Scrape Conference Speaker Lineups for Trend Detection

How to Scrape Conference Speaker Lineups for Trend Detection

Conference speaker lineups are a leading indicator of industry trends. When multiple conferences simultaneously feature talks on a topic, it signals emerging demand months before mainstream adoption. Let’s build a scraper that tracks speaker lineups across tech conferences and identifies trending topics.

Why Conference Data Matters

By the time a topic appears in a Gartner report, it’s already mainstream. Conference organizers curate lineups 3-6 months ahead based on what’s gaining traction. Tracking these patterns gives you an early warning system for industry trends.

Building the Conference Scraper

import requests
from bs4 import BeautifulSoup
import re
from urllib.parse import urljoin

SCRAPER_API_KEY = "YOUR_KEY"

class ConferenceScraper:
    def scrape_speakers(self, conference_url):
        response = requests.get(
            "http://api.scraperapi.com",
            params={
                "api_key": SCRAPER_API_KEY,
                "url": conference_url,
                "render": "true"
            },
            timeout=60
        )
        soup = BeautifulSoup(response.text, "html.parser")
        speaker_links = []
        for link in soup.find_all("a", href=True):
            href = link["href"].lower()
            text = link.get_text().lower()
            if any(kw in href or kw in text for kw in ["speaker", "schedule", "agenda", "session"]):
                full_url = urljoin(conference_url, link["href"])
                speaker_links.append(full_url)

        speakers = []
        for page_url in set(speaker_links[:5]):
            page_speakers = self._scrape_speaker_page(page_url)
            speakers.extend(page_speakers)
        return speakers

    def _scrape_speaker_page(self, url):
        response = requests.get(
            "http://api.scraperapi.com",
            params={"api_key": SCRAPER_API_KEY, "url": url, "render": "true"},
            timeout=60
        )
        soup = BeautifulSoup(response.text, "html.parser")
        speakers = []
        cards = soup.select(
            ".speaker-card, .speaker-item, .speaker, "
            "[class*='speaker'], [class*='presenter']"
        )
        for card in cards:
            name_el = card.select_one("h2, h3, h4, .speaker-name, .name")
            title_el = card.select_one(".title, .role, .position, .company")
            talk_el = card.select_one(".talk-title, .session-title, .topic")
            if name_el:
                speakers.append({
                    "name": name_el.get_text(strip=True),
                    "title": title_el.get_text(strip=True) if title_el else "",
                    "talk": talk_el.get_text(strip=True) if talk_el else "",
                    "source_url": url
                })
        return speakers

Topic Extraction and Clustering

from sklearn.feature_extraction.text import TfidfVectorizer
from collections import Counter
import numpy as np

class TopicAnalyzer:
    STOP_WORDS = {
        "talk", "session", "keynote", "workshop", "panel",
        "introduction", "building", "using", "deep", "dive"
    }

    def extract_topics(self, speakers):
        talks = [s["talk"] for s in speakers if s.get("talk")]
        if not talks:
            return []
        vectorizer = TfidfVectorizer(
            max_features=1000, stop_words="english",
            ngram_range=(1, 3), min_df=2
        )
        tfidf = vectorizer.fit_transform(talks)
        feature_names = vectorizer.get_feature_names_out()
        mean_scores = np.asarray(tfidf.mean(axis=0)).flatten()
        top_indices = mean_scores.argsort()[-30:][::-1]
        topics = []
        for idx in top_indices:
            term = feature_names[idx]
            if term.lower() not in self.STOP_WORDS:
                topics.append({
                    "term": term,
                    "score": float(mean_scores[idx]),
                    "frequency": int((tfidf[:, idx] > 0).sum())
                })
        return topics

    def detect_trends(self, current_topics, previous_topics):
        current_dict = {t["term"]: t["score"] for t in current_topics}
        previous_dict = {t["term"]: t["score"] for t in previous_topics}
        trends = []
        for term, score in current_dict.items():
            prev_score = previous_dict.get(term, 0)
            if prev_score == 0 and score > 0.01:
                trends.append({"term": term, "type": "NEW", "score": score})
            elif score > prev_score * 1.5:
                growth = (score - prev_score) / max(prev_score, 0.001)
                trends.append({"term": term, "type": "GROWING", "growth": round(growth, 2)})
        return sorted(trends, key=lambda x: x.get("score", x.get("growth", 0)), reverse=True)

Cross-Conference Analysis

def cross_conference_analysis(conference_data):
    topic_conference_map = {}
    for conf_name, speakers in conference_data.items():
        analyzer = TopicAnalyzer()
        topics = analyzer.extract_topics(speakers)
        for topic in topics:
            term = topic["term"]
            if term not in topic_conference_map:
                topic_conference_map[term] = []
            topic_conference_map[term].append({
                "conference": conf_name,
                "score": topic["score"]
            })
    trending = {
        term: confs for term, confs in topic_conference_map.items()
        if len(confs) >= 3
    }
    return dict(sorted(trending.items(), key=lambda x: len(x[1]), reverse=True))

Scaling with Proxy Infrastructure

Scraping dozens of conference sites requires reliable proxies. ScraperAPI handles JavaScript-rendered conference pages. For geo-specific conferences, ThorData residential proxies work well. ScrapeOps monitors scraping health.

Running the Full Pipeline

conferences = {
    "PyCon 2026": "https://us.pycon.org/2026/schedule/",
    "KubeCon EU": "https://events.linuxfoundation.org/kubecon/",
    "AWS re:Invent": "https://reinvent.awsevents.com/sessions/"
}

scraper = ConferenceScraper()
all_data = {}
for name, url in conferences.items():
    speakers = scraper.scrape_speakers(url)
    all_data[name] = speakers
    print(f"{name}: {len(speakers)} speakers")

trends = cross_conference_analysis(all_data)
for topic, confs in list(trends.items())[:10]:
    print(f"TRENDING: {topic} ({len(confs)} conferences)")

Conference lineups are one of the most underutilized data sources in tech. Start tracking them systematically and you’ll spot trends months before they hit mainstream awareness.