ProductBuilding
Foldpin
A native Mac sticky notes app for capturing thoughts, keeping them beside your work, and folding them out of the way.
Hey 👋, I'm Jason Yu
Software Engineer / Builder
/ Currently building
What I’m making now
Tools, experiments, and small products taking shape.
DirectionExploring
Small Tools
Focused utilities that remove friction from everyday work.
DirectionExploring
Game Experiments
Small playable ideas, mechanics, and worlds in progress.
/ Recent writing
Notes and essays
macOSDeveloper ToolsBuilding in Public
Building Foldpin: A Native Sticky Notes App for Mac
Why I’m building Foldpin, a native Mac sticky notes app, and what the current prototype can do—from block editing and Markdown paste to folded notes and quick voice recording.
AIDeveloper ToolsLocal-First
imtty: Keeping a Codex Session Going from Telegram
imtty came from a specific annoyance: the useful Codex session was already running on my Mac, but I still needed a way to keep it moving when I left the desk.
Supply ChainAI AgentsDeveloper Tools
A Supply-Chain Guardrail for AI Coding Agents
A project note on why dependency work needs explicit guardrails when AI coding agents add packages, run CLIs, or change lockfiles.
Build in public. Ship small. Learn fast. Iterate forever.