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Not vague AI feedback. A specific diagnosis: which expert concepts you nailed, which you missed, and a study plan that evolves with every session.
All problems free during beta · No signup required to start
The system
Three modes, one diagnosis loop. Every session feeds your skill profile so you always know what to study next.
What you get after every session
Other tools say “pretty good, consider caching.” We tell you which 13 expert checkpoints you hit, which 5 you missed, and what to study.
The difference
Same answer, same problem. One gives you something to act on.
How it works
Choose a system design problem — URL Shortener, Rate Limiter, and more.
Requirements → API → Architecture → Data Model → Scaling. Structured workspaces, not a blank page.
Check your work against expert checkpoints per stage. Or do a full AI mock interview.
Your diagnosis maps every miss to a skill and lesson. Retry with targeted focus.
What's included
Expert skills tracked
Interview stages
Expert checkpoints
Free sessions
Every session tells you exactly what to study next. Free during beta — no signup required.