Mock system design interviews,
run by your own AI agent
Draw the System is a hosted interview workspace. Connect the Claude subscription you already have — it plays a demanding senior/staff-level interviewer: asking, listening, reading your diagram, and grading you against a real rubric.
How it works
Get a 30-day pass
One flat price, one-time payment — no auto-renew unless you ask for it. No token markup — ever.
Connect your agent
Point Claude (or any MCP client) at the interview server and authorize it with a one-time code.
Get interviewed
Your agent runs a real 45-minute loop: scenario, probing questions, a live canvas, then a rubric-graded debrief.
Bring-your-own-agent means your agent subscription does the thinking — we never resell tokens, so the price stays flat.
Built like a real loop
A canvas your interviewer can read
Draw your architecture in Excalidraw; the agent reads a structural digest of it — components, edges, dangling arrows — and pushes back like a person at the whiteboard.
Real interview pressure
A server-side clock, spoken questions, and a voice loop. Answer out loud or type — your call.
Graded like the real thing
Ten rubric dimensions with 1/3/5 anchors, a written debrief, a reference solution diagram, and progress tracked across sessions.
Company-style loops
Point a session at a company profile from the catalogue and the brief takes on that domain and its constraints. Or run generic — the rubric is identical.
Prefer local-first?
The interview skills, rubric, and diagram tools are open source (MIT) and run entirely on your machine with Claude Code — no account needed. The cloud version adds the hosted workspace, voice loop, storage, and the remote MCP server.
Draw the System on GitHub