Product thinking
Finding the one moment that matters and building everything around it.
Product and software
Jack Fay
I build products end to end, from the core insight to the live deployment.
Most recently: Switchback, a recovery-support app engineered around the single moment that decides everything.
What I do
Full-stack engineering
Next.js, React, TypeScript, Postgres, and production deployment.
AI integration
Building with Claude and LLMs where they help, and knowing where not to trust them.
Featured project
Switchback
Switchback is a live recovery-support app built around a single make-or-break moment: urge, opens app, does not relapse. It is in private alpha with real users, backed by 37 database tables, Row-Level Security on every one, and deterministic crisis routing where the stakes are too high for a model call.