Backend, AI & systems architecture.
I go by Wcowin. I build the parts of software people rarely see: payment rails, AI model pipelines, blockchain settlement, and the data systems that keep them honest. On the side I ship Mac tools that I want to use every day.
A professional clipboard manager for the Mac. Everything you copy, kept searchable and organized - text, links, snippets, files - so the thing you need three copies ago is one keystroke away.
Cut and move files in Finder the way it should have always worked. A small extension that adds true move (not copy) to the Mac's file manager.
Notes on backend systems, AI model architecture, and the Mac tools I build. Where the work-in-progress thinking lives.
wcowin.workPayment and settlement systems should be predictable above all. I optimize for the path where nothing surprising happens, then handle the edges loudly.
Redis, the right indexes, and caching that knows when it's wrong. Fast isn't a nice-to-have when money or a model is on the line.
Models are one component. The architecture around them - queues, fallbacks, observability - is what makes them usable in production.
OneClip and FinderClip exist because I wanted them. Software for the Mac should feel native, quiet, and respectful of the person using it.
Payments, AI infrastructure, blockchain settlement, or a Mac app that respects its users. Reach out through GitHub or the blog.
Kewen Wang · Wcowin · 2026