Coding (Platform)
Workspace: Fastify Difficulty: Hard Time: 90 minutes
A project reservation endpoint already handles a single successful request. Under duplicate delivery or concurrent requests, it rejects valid retries or oversells the final seat. A repository write can also fail. Repair the consistency boundary while preserving the HTTP application and public receipt format.
Retry Safe Reservations is a coding (platform) interview exercise that trains prompt interpretation, explicit assumptions, a concrete response, and a clear explanation of tradeoffs. The catalog marks it as hard difficulty. It focuses on Technical Reasoning, Testing, Validation. The signed-in workspace provides the tools for the round and evaluates the attempt against task-specific criteria. Reference solutions, hidden checks, evaluator instructions, and candidate work remain private.