# Jonah Cohen

> I build fast, well-structured software — from autonomy stacks and game engines to the systems behind an AI app builder.

- Location: Ann Arbor, MI
- B.S.E. Computer Science, University of Michigan — expected December 2026
- Email: jonahc0508@gmail.com
- Site: https://jonah-portfolio-a3e75f.web.app

I'm a computer science student at the University of Michigan. This summer I interned at CodeHS on Bool, an AI app builder: a prompt becomes a hosted web app. Most of the six weeks went into the parts that fail silently — a credit meter that wasn't measuring cost, a deploy path agents couldn't finish, and login links that mail scanners burned before a person could click them.

I'm also the AI lead on UM::Autonomy, where I run a 30-person team across computer vision, navigation and controls, and task planning. A lot of what I know about software came from watching a perception pipeline fail on the water and having to explain why.

I like the parts of the stack most people skip: memory layouts, message boundaries, the reason a thing is slow. That shows up in a 2D game engine I wrote in C++ that resolves collisions between 100,000+ entities, and in a telemetry layer built on Zenoh and Protobuf that keeps 15+ distributed ROS2 nodes talking to shore.

I work end to end when the project calls for it — the photo-sharing site I maintain is React and Next.js on top of a custom OAuth flow I designed against Firebase and Adobe's APIs. I care about software that's still understandable a year after it ships.

## Pages

- [Home](https://jonah-portfolio-a3e75f.web.app/): I build fast, well-structured software — from autonomy stacks and game engines to the systems behind an AI app builder.
- [About](https://jonah-portfolio-a3e75f.web.app/about.md): bio, stack, and timeline
- [Work](https://jonah-portfolio-a3e75f.web.app/projects.md): project catalogue
- [Contact](https://jonah-portfolio-a3e75f.web.app/contact.md): email and socials

## Projects

- [Bool](https://jonah-portfolio-a3e75f.web.app/projects/bool.md): Credit metering, deploys, and reliability for an AI app builder.
- [Catcam](https://jonah-portfolio-a3e75f.web.app/projects/catcam.md): YOLO on an RTSP kitchen camera that only fires when the cat is on the counter.
- [2D Game Engine](https://jonah-portfolio-a3e75f.web.app/projects/game-engine.md): A from-scratch C++ engine that resolves 100,000+ entities.
- [Autonomous Surface Vessel Stack](https://jonah-portfolio-a3e75f.web.app/projects/autonomy-perception-stack.md): Perception and telemetry for a competition autonomous boat.
- [Photographer Website](https://jonah-portfolio-a3e75f.web.app/projects/photo-website.md): Full-stack photo sharing with a hand-rolled OAuth flow.
- [ADS-B Telemetry Gateway](https://jonah-portfolio-a3e75f.web.app/projects/adsb-telemetry-gateway.md): Live aircraft traffic from an antenna to a network topic, encrypted in hardware along the way.
- [How Important Is the Quarterback?](https://jonah-portfolio-a3e75f.web.app/projects/qb-model.md): A win-rate model that predicts a season to within 1.71 games.
- [Discord Music Bot](https://jonah-portfolio-a3e75f.web.app/projects/discord-music-bot.md): YouTube and Spotify playback in voice chat.

## Optional

- [Full site text](https://jonah-portfolio-a3e75f.web.app/llms-full.txt): every page in one document