Work
Draw the System
Open-source system-design interview practice — your own AI agent plays interviewer while you draw.
System-design interviews are a drawing exercise graded like an essay, and most people practice for them by reading. Draw the System makes you draw: a local workbench puts a real Excalidraw canvas, a brief, a timer, and a voice panel in front of you, and the AI coding agent you already pay for takes the other chair.
The agent plays researcher, interviewer, and grader through portable Agent Skills — it reads up on the company you're interviewing with, runs a timed spoken mock, then grades the canvas against a rubric and shows you a reference architecture next to yours. Claude Code, Codex, Cursor, Gemini, OpenCode: any of them, any model.
Everything is files in the repo. No accounts, no hosted service, MIT-licensed and free. The cloud version is the same brain with a workspace around it.