Backend Software Engineer Interview Questions

9,104 backend software engineer interview questions shared by candidates

Can you explain the Node.js event loop and how it handles non-blocking I/O? Describe a time you had to optimize a slow database query. What was your approach? How would you design a rate-limiter for an API gateway? How would you ensure data consistency in a microservices architecture? Tell me about a time a project you were on failed. What did you learn? How do you handle error logging and monitoring in a distributed system?

Backend Developer

Interviewed at Keus

4
Aug 25, 2025

Can you explain the Node.js event loop and how it handles non-blocking I/O? Describe a time you had to optimize a slow database query. What was your approach? How would you design a rate-limiter for an API gateway? How would you ensure data consistency in a microservices architecture? Tell me about a time a project you were on failed. What did you learn? How do you handle error logging and monitoring in a distributed system?

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