● 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 analytics dashboard runs heavy aggregation queries directly against the production OLTP database, slowing user writes. Find the bottleneck and fix it.

Keep writes fastDashboards can tolerate minutes of staleness

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

Bottleneck ◯·Fix ◯·Trade-off ◯

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