● 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: 'Two services need to stay in sync after a write. Compare doing it with a synchronous call vs an event/queue, and when you'd pick each.'
State failure modes of eachPick one with a reason
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.