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Backend Developer interview questions

The most likely questions in a Backend Developer interview. Prepare EACH from your real experience — below we build your answers free.

Role-specific questions

1. 1. How would you design a REST API for a resource with complex relationships?
2. 2. Explain how you avoid the N+1 query problem.
3. 3. When would you use a message queue instead of a synchronous call?
4. 4. How do you guarantee idempotency in a payments endpoint?
5. 5. Walk me through how you'd scale a service that suddenly gets 10x traffic.
6. 6. What indexes would you add to speed up a slow query, and how do you verify it?

The usual behavioral ones

1. 1. Tell me about yourself and your experience.
2. 2. Why do you want this role and this company?
3. 3. Tell me about a project you're proud of and your specific contribution.
4. 4. Tell me about a mistake you made and what you learned.
5. 5. How do you handle a disagreement with a teammate or your manager?
6. 6. Where do you see yourself in a couple of years?

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