About

I'm Jim Jonah. For twenty-something years I've built the systems other systems depend on — identity, parsers and interpreters, distributed platforms, performance tooling. The domains kept changing; the job didn't: make the foundation correct, fast, and durable.

How I work

I'm hands-on by choice. I lead by writing code, reviewing it, pairing on the hard parts, and unblocking people — not by managing from a distance. I design a thing and then ship it; I don't hand off the interesting half. Most of what I'm proud of is infrastructure you never notice, because it just works.

Over the years I've grown teams from a few people to ninety, and the lesson that stuck is that shipping is a discipline, not an event.

What I write about

Public writing is new for me. Most of what I work on is a trade secret — but not all of it. Side projects, things I've picked up for my own growth, and work old enough to talk about freely are all fair game. That's what shows up here: the shareable parts, written down so I understand them better.

Elsewhere

You can find me on Bluesky and LinkedIn, or see what I'm building on the Selected work page. Posts here are published on the AT Protocol, so the writing lives in an open, portable format I control.