● 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

Estimate the daily write volume and 1-year storage for an analytics events pipeline.

5M DAUAvg 30 events/user/dayAvg 1 KB/event

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

Assumptions ◯·Math ◯·Result ◯

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