AI & Product Builder
I'm Bill Prin, a San Francisco-based engineer writing the AI Engineering Report and building indie software products.
Recent Articles
- 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
- 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 - and Why It’s a Big Deal for AI Workflows
- ai-substackTechMay 1, 2025Making a Video Game with AI By Just Typing English (Vibe Coding Game Jam)
Scroll to the bottom to read older articles.
About
Over 13 years in Google, Pinterest, and various startups, I've built everything from cloud infrastructure to ML systems. While my core work has been in engineering, I've always been deeply interested in product strategy and the intersection of technical and business decisions.
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, 5000 registered users and 200 weekly active users. I also wrote a book on GTO strategy called GTO for Live Poker and have a poker strategy Youtube.
📈 Interstitch: an app for interstitial journaling, a time-tracking tool for personal productivity.
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. (I typically reply to everyone except agency recruiters and cold sales pitches.)
Resources
Useful guides, deep dives, and reference posts from billprin.com (not on Substack).
- billprin.comTechMay 8, 2025How to Let Claude Access Your Notion data via MCP
- billprin.comTechApril 22, 2025How to Use MCP to Let Your AI IDE See and Fix Browser Console Errors (with Cursor)
Older Articles
I have two Substacks and the subscription box above is for AI Engineering Report. If you're interested in my writing on product, marketing, business, or general life topics, head to writing.billprin.com and subscribe.
- biz-substackBusinessFebruary 4, 20252024 review, 2025 plan
- biz-substackBusinessOctober 24, 2024The Power of Parasite SEO (Oct 2024 Update)
- biz-substackBusinessJune 6, 2024Selling Out
- biz-substackBusinessMay 10, 2024Making Two People Happy (Apr 2024 Retro)
- biz-substackBusinessMarch 28, 2024From $20 to $375 in Revenue : March 2024 Update
- biz-substackBusinessJanuary 4, 2024Promoting On Reddit (or anywhere) By Giving Before Asking
- biz-substackBusinessDecember 17, 2023Live Poker Theory Update, Dec 17 2023
- biz-substackBusinessDecember 10, 2023The Mental Game of Entrepreneurship
- 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
- billprin.comTechMay 21, 2015A Simple Tox Tutorial