real-time marketplace & backend systems
Xinghan Yin
With AI getting so good at coding, being able to write clean, reliable code yourself doesn't seem to count for as much anymore. You can spend hours on something, even hundreds of hours, and that effort can feel pretty small next to what AI can do. Ideas seem to matter more now.
I'm always coming up with ideas. Some of them are pretty out there. Now that it takes less time and money to turn an idea into a product, I get to try mine out every day.
Selected Systems
shippedWriting / Notes
engineering writeupsAbout
profileI'm Xinghan Yin, based in the New York / New Jersey area.
Most of my time goes to GGBOYS, a real-time digital-asset marketplace where I lead the engineering. From trading and escrow to market data and risk, almost all of it is my own work — I built it, and I keep it running, with a disciplined AI coding-agent workflow. The tooling that grew around that process, like MemTree (the memory those agents read before they touch a file), only exists because months of real work forced it: a process that has to stay reliable that long can't live entirely in my head.
I came up through competitive programming, and I'm stubborn about getting things right. What keeps me up isn't a system going down, but the quiet kind of wrong: a wrong value written somewhere, no error raised, nothing in the logs, and by the time anyone notices it's too late. My whole discipline, in the end, is built against exactly that.
- Role
- Co-founder · led engineering · GGBOYS (2025–present)
- Focus
- Real-time marketplace · full-stack · backend · AI coding-agent workflows
- Based
- New York ⇄ New Jersey · open to remote
- Stack
- Python · TypeScript · Vue / Nuxt · FastAPI · PostgreSQL / Redis · Docker
- AI · LLM
- Coding agents · multi-agent orchestration · evals · agent memory
- Education
- M.S. Software Engineering, NJIT (2023–2025)