Hi, I'm jiechen (GitHub @bbfans), an AI / Cloud / DevOps / Full Stack / Mobile Engineer. This site is where I keep notes on the tools I'm building, the systems I'm learning from, and the small experiments that make my workflow better.

My current work sits around AI agent workflows, full-stack web apps, Android, iOS, backend systems, frontend quality, DevOps, infrastructure, FastAPI, Playwright automation, and practical TypeScript/Python tooling. I care about systems that are easy to deploy, easy to inspect, and useful enough to run every day.

I use bbfans.github.io as a public workbench: part project index, part changelog, part technical journal. The writing here is intentionally close to the work, with rough edges removed only when they get in the way.

If you want the shortest version: I like making developer tools that stay small, ship fast, and explain themselves in code.