I graded my own ML option forecasts. Here's the Brier score.
In May I promised — out loud, on the internet, where people can screenshot you — that I'd grade Helium's published prob_itm forecasts when the June 20…
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Clearing an off grid price bug out of Polymarket's order path
This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry . Project Overview Polymarket ships a unified Python SDK, py-sdk ,…
From Documents to Intelligent Answers: Building a RAG Agent from Scratch & Lessons Learned
Artificial Intelligence applications are rapidly moving beyond simple question-answering systems. Modern enterprise AI assistants need to understand i…
I Cut My AI API Bill by 95% — Here's How You Can Too
I gotta say, i Cut My AI API Bill by 95% — Here's How You Can Too Picture this: it's a Tuesday morning, I'm staring at my dashboard, and my jaw is on …
About that 'your 997 says rejected but not why' problem...
Somebody on Reddit posted about 997s that just say AK5*R*5 — one or more segments in error — no AK3 , no AK4 . Preach. That's the problem this free do…
Transcribe Audio to Text Like a Developer: From File to Final Text
You've got a two-hour architecture review sitting in your Downloads folder. Last month, mine was a 94-minute mess where three engineers talked over ea…
How to Transcribe Audio to Text: A Practical Workflow for Developers
You've got a 45-minute meeting recording sitting on your desktop. Maybe it's a podcast raw file, or an interview you did for a project. You need it in…
How I built a lightweight standalone behavioral anti-stealer to protect my Windows environment
Hey everyone, Tired of bloated corporate solutions eating up hundreds of megabytes of RAM just to monitor active local connections, I decided to build…
I Ran 10 AI Coding Models Through 5 Tasks: A Data Scientist's Take
I Ran 10 AI Coding Models Through 5 Tasks: A Data Scientist's Take I'll be honest — I went into this expecting a clear winner. I came out with a scatt…
Build a Local LLM Chatbot with Ollama and Python
Build a Local LLM Chatbot with Ollama and Python Build a Local LLM Chatbot with Ollama and Python Imagine typing a question into your chatbot and gett…
How I Cut My OpenAI Bill by 97% — The Full Migration Guide
How I Cut My OpenAI Bill by 97% — The Full Migration Guide I still remember the morning I opened my OpenAI dashboard and saw the damage. $487.63 gone …
Mastering FastAPI Background Tasks: Real‑World Patterns, Testing, and When to Reach for Celery
Introduction If you’ve built a FastAPI endpoint that needs to send a confirmation email, generate a PDF, or kick off a long‑running data import, you p…
Auto-Tag Your Music Library — With Confidence Scores
"Tag my whole catalogue by mood, energy and genre" is one of those jobs that sounds like a weekend script and turns into a procurement cycle. The ente…
Half-Time vs Double-Time BPM Detection: How We Fixed Spotify's Known Accuracy Gap
Run Blinding Lights by The Weeknd through Essentia's RhythmExtractor2013 . It returns 85.4 BPM. The track is famously 171 BPM — one of the most-played…
Automating Production: A CI/CD Pipeline for Google Cloud Run with GitHub Actions
Introduction In the last guide , we deployed our FastAPI app to Google Cloud Run manually. It worked, but "manual" is a dirty word in modern engineeri…
Build a Harmonic DJ Set Planner in 50 Lines
When Spotify deprecated audio_features and audio_analysis , the obvious loss was the per-track numbers — tempo, key, energy. The quieter loss was ever…
The Spotify /recommendations Replacement
When people talk about the Spotify Web API deprecations, they usually mean audio_features and audio_analysis — the per-track numbers. But the same Nov…
FastAPI WebSockets: Production-Ready Setup and Scaling
FastAPI websockets let you push data to a client the moment it changes, without the overhead of polling. In a few lines you can expose a bidirectional…
A Practical Guide to Proxies for Web Scraping (with Python examples)
If you have written more than a couple of scrapers, you already know the pattern. The first few hundred requests fly through. Then responses slow down…
Как выбрать язык программирования для ребёнка
Родители могут месяцами выбирать курс и язык программирования для ребёнка. Аргументы разные: Python самый популярный, а JavaScript нужен везде. А пото…
Memoization from First Principles: Building and Tracing a Cache
Understanding memoization by implementing it manually and watching the cache state change alongside each recursive call. Memoization is one of those c…
React Native + Expo JWT Auth with FastAPI — A Complete Working Example
Most FastAPI JWT tutorials stop at "here's how you issue a token" and never cover the parts that actually break in production: where to store the toke…
I Made My Voice Agent Feel Faster by Streaming Sentences, Not Audio
The annoying thing about voice agents is that “the model is fast” does not mean the experience is fast. I had a small voice assistant running on a loc…
How to Scrape Trip.com and Ctrip Hotel Reviews in 2026 (Python + a No-Code Shortcut)
Most "Trip.com scrapers" only see half the picture. Trip.com is the international brand, but the same hotel usually has a much larger pool of reviews …
How to Scrape G2 Reviews in 2026 (Python + a No-Code Shortcut)
If you have tried to scrape G2 reviews with a quick requests.get() , you already know how it goes: a 403 , a CAPTCHA, or a blank page. G2 is one of th…
Day 4/30: Persistent StateGraph
I still remember the frustration of watching my first LangGraph agent fail miserably after just two turns. I had built a simple support bot designed t…
The same input gave me a different translation every time. The bug wasn't where I thought.
I kept re-running the exact same input through my translation app. Same code. Same model. Same everything. And the word "machines" kept flipping betwe…
The Adversarial Resilience Score: A New Metric for AI-Generated Code
The problem with "this AI writes secure code" Every AI coding tool now claims some flavor of security-awareness. Almost none of them will tell you, in…
I Got Tired of Bad Fanfiction Recommendations, So I'm Building My Own Taste Engine
I read fanfiction. A lot of it, on AO3 and FanFiction.net. Finding something worth reading takes longer than it should. AO3 has over 10 million works.…
Build your first AR glasses lens in 10 minutes (no hardware needed)
DreamLayer is an open source memory layer for AR glasses (Apache-2.0). It has a plugin system, called lenses, and the smallest complete one is about 2…