● Free · no signup · ~5 min

Try a system design drill

One focused, interview-style prompt. Write a short answer and an AI interviewer grades it in seconds.

The prompt

An interviewer asks: 'Your rate limiter uses a fixed window. Show me a burst pattern that lets a client exceed the limit, and how a sliding window or token bucket fixes it.'

Give a concrete burstCompare the two fixes

Your answerFill in each line — schema, bullets, or prose.

Answer ◯·Assumptions ◯·Edge case ◯

No diagram needed for a drill — that's what the full interview is for.