System design interview question
"Design an online examination system. A hundred thousand candidates take the same timed exam starting at exactly 10am. Answers must never be lost — a candidate's laptop crashing must not cost them their exam — questions must not leak, and cheating must be made difficult. Results are published afterwards."
a scheduled, synchronized, high-stakes event where the consequences of failure are unusually severe — a lost answer is a person's exam result, not a retryable request. The distinguishing content is: answer durability against client failure, preventing question leakage, and the fact that every candidate starts at the same instant.
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