System Design – Idempotency
Practice system design interview questions on idempotency. Cover why it matters, how to implement it, and common patterns. Answer questions and receive feedback on clarity and trade-offs. Ideal for software engineer system design prep. First 2 questions are free with full feedback.
- Level Intermediate
- Questions 12
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Sample system design – idempotency interview questions
Preview 6 questions from this track in quiz order. In the full quiz you answer one at a time — type or speak — then get a score and feedback.
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What is idempotency?
What a strong answer includes
Same request can be repeated safely.
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Why does idempotency matter in APIs?
What a strong answer includes
Retries won’t cause duplicates.
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Which HTTP methods are idempotent?
What a strong answer includes
GET, PUT, DELETE (typically).
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How do you make a POST idempotent?
What a strong answer includes
Uses an idempotency key.
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What is an idempotency key?
What a strong answer includes
Client-generated unique key for the request.
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How do you store idempotency keys?
What a strong answer includes
Cache or database with TTL.