Coding·45 minMembers

Idempotency API with Idempotency-Key Header

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HE round opener: design and implement an API endpoint that deduplicates retries via an `Idempotency-Key` header. The interviewer hands you a spec sheet and watches whether you cover replay semantics, ...

SWE

idempotency

concurrency

hashmap

medium

Frequency

Single report

Last asked

2026-01-26

Stage

onsite-coding