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Mock interviews

How the AI system design mock interview works: six phases, three levels and a review that names the biggest fix first.

Pick an interview

• Distributed rate limiter: Limit every API key to its plan across 50 servers, at 200 000 checks a second, without slowing the API or taking it down.
• Ticket booking: Sell 50 000 seats to a million people in a few minutes, never selling one seat twice, with holds that expire.
• Search suggestions: Suggest the top five completions on every keystroke, from what readers searched for, in under 100 ms.
• Nearby places: Find the places near a reader among 200 million, in dense cities and empty country alike, within 200 ms.