AI & Product Builder
I'm Bill Prin, a San Francisco-based engineer writing the AI Engineering Report newsletter and creating videos on YouTube. I'm building indie software products such as Live Poker Theory, a GTO poker training platform which I developed end-to-end across web, iOS, and Android, and Systematic FYI, an iOS flashcard app for system design interview preparation.
Latest Articles
From the AI Engineering Report
- ai-substackTechOctober 16, 2025Claude Code vs Codex: I Built A Sentiment Dashboard From 500+ Reddit Comments
- ai-substackTechOctober 7, 2025OpenAI Dev Day: Sora 2 Stole the Show
- ai-substackTechOctober 1, 2025Claude Code 2.0 Is Promising But Flawed
- ai-substackTechSeptember 24, 2025The Hidden Costs of Claude Code: Cost Optimization and Token Usage Monitoring
- ai-substackTechSeptember 9, 2025Devs Cancel Claude Code En Masse - But Why?
- ai-substackTechAugust 20, 2025Scaling Claude Code with GitHub Actions and Pull Requests
- ai-substackTechAugust 6, 2025How YC Startups Use AI: Agents, OCR, and Prompt Engineering with Mercoa (YC W23)
- ai-substackTechJuly 29, 2025Claude Code vs Cursor: First Look On A Real Dev Problem
- ai-substackTechJune 25, 2025From Zero to Monetized iOS App in 10 hours with Bolt.new, Expo, and RevenueCat
- ai-substackTechJune 12, 2025Speedrunning an AI Art App With bolt.new, Supabase, and Replicate
Recent Videos
- YouTubeTechOctober 15, 2025Claude Code vs Codex: I Built A Sentiment Dashboard From 500+ Reddit Comments
- YouTubeTechSeptember 24, 2025The Hidden Cost of Claude Code: Cost Optimization and Token Usage Monitoring
- YouTubeTechSeptember 10, 2025Devs CANCEL Claude Code En Masse — But Why?
Projects
♠️ Live Poker Theory: my most popular project, a flashcard trainer to learn GTO (game-theory optimal) poker and GTO strategy blog.Web app written in React and native app for iOS and Android written in React Native, 8000 registered users and 300 weekly active users. I also wrote a book on GTO strategy called GTO for Live Poker and have a poker strategy Youtube.
📚 Systematic FYI: an iOS flashcard app for system design interview preparation, helping engineers study for interviews at FAANG companies. This was built as part of the bolt.new hackathon, and I blogged about the development process here.
📈 Interstitch: an app for interstitial journaling, a time-tracking tool for personal productivity. It's a spinoff of a larger life logging (or, quantified self) project called Navigoals, a passion project of mine involving tracking personal analytics and feeding them into LLMs for coaching. Navigoals is currently unreleased—reach out if this topic interests you!
Contact
📧 Email me at waprin@gmail.com. I enjoy hearing from readers and potential collaborators and do my best to respond to all relevant emails.
More AI Writing
Additional technical articles and tutorials
- ai-substackTechMay 28, 2025Building a Custom MCP Server to Query Firebase from Cursor
- ai-substackTechMay 15, 2025AI Engineer (AIE) vs. Machine Learning Engineer (MLE) : Why Hacker News Purists Are Wrong
- ai-substackTechMay 9, 2025Connecting Claude to Notion with MCP
- billprin.comTechMay 8, 2025How to Let Claude Access Your Notion data via MCP
- ai-substackTechMay 1, 2025Making a Video Game with AI By Just Typing English (Vibe Coding Game Jam)
- billprin.comTechApril 22, 2025How to Use MCP to Let Your AI IDE See and Fix Browser Console Errors (with Cursor)
Other Writing
Older articles on tech, business, and other topics
- billprin.comTechOctober 30, 2022Why I Ditched Django for NextJS
- billprin.comTechOctober 11, 2020The Curious Physics of Slime Volleyball
- billprin.comTechMay 12, 2020Showing Local Timezones in Javascript
- MediumTechAugust 29, 2017A TensorFlow Glossary/Cheat Sheet
- MediumTechDecember 13, 2016Local Django on Kubernetes with Minikube
- MediumTechAugust 8, 2016Scalable Video Transcoding With App Engine Flexible
- MediumTechMarch 31, 2016Deploying Django, Postgres, and Redis Containers To Kubernetes (Part 2)
- MediumTechFebruary 26, 2016Deploying Django, Postgres,Redis Containers To Kubernetes
- billprin.comTechMay 21, 2015A Simple Tox Tutorial