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6,409 python engineer interview questions shared by candidates

1. How do you handle cache invalidation in a distributed system? 2. How do you design an application for resiliency? 3. How do you ensure scalability and high availability at the same time? 4. How do you handle idempotency in APIs, and what problems does it solve? 5. What scenarios require idempotency keys? 6. How do you design an API to safely handle retries and duplicate requests? 7. How do you design a FastAPI endpoint to handle timeouts and partial failures? 8. What are the three types of timeouts in distributed systems, and where do they apply? 9. How does FastAPI handle high-throughput concurrent requests asynchronously? 10. How do you call one microservice from another asynchronously? 11. How do you securely communicate between microservices? 12. How do you design a system for zero-downtime deployment? 13. How do you choose between PostgreSQL, MongoDB, and Redis in system design? 14. How do you maintain data consistency across microservices? 15. What are common failure modes in microservices, and how do you mitigate them? ⸻ Distributed Transactions / Consistency 16. What is the Saga pattern? 17. Why do we need Saga instead of distributed transactions (2PC)? 18. What are the types of Saga patterns? 19. How do compensating transactions work? 20. What problems can occur in Saga implementations? 21. How do you handle partial failure in a Saga-based system? ⸻ Frontend / React (Senior Level) 22. How do you handle state normalization in frontend applications? 23. How do you manage global state in large React applications? 24. How do you avoid unnecessary re-renders in React? 25. When do you use useMemo, useCallback, React.memo, and when not? 26. How do you design frontend state for performance and scalability? ⸻ DevOps / Deployment / Containers 27. How do you optimize Dockerfiles for production? 28. How do you structure Dockerfiles differently for React frontend vs FastAPI backend? 29. How do you reduce Docker image size and build time? 30. How do you manage multiple microservices Docker builds efficiently? 31. How do you handle configuration and secrets securely in containers? ⸻ Cross-Cutting Architecture Questions 32. How do you design APIs to be fault-tolerant? 33. How do you handle timeouts, retries, and circuit breakers together? 34. How do you prevent cascading failures? 35. How do you balance consistency vs availability in real systems?
avatar

Python Full Stack Developer

Interviewed at Embitel Technologies

3.5★
Jan 30, 2026

1. How do you handle cache invalidation in a distributed system? 2. How do you design an application for resiliency? 3. How do you ensure scalability and high availability at the same time? 4. How do you handle idempotency in APIs, and what problems does it solve? 5. What scenarios require idempotency keys? 6. How do you design an API to safely handle retries and duplicate requests? 7. How do you design a FastAPI endpoint to handle timeouts and partial failures? 8. What are the three types of timeouts in distributed systems, and where do they apply? 9. How does FastAPI handle high-throughput concurrent requests asynchronously? 10. How do you call one microservice from another asynchronously? 11. How do you securely communicate between microservices? 12. How do you design a system for zero-downtime deployment? 13. How do you choose between PostgreSQL, MongoDB, and Redis in system design? 14. How do you maintain data consistency across microservices? 15. What are common failure modes in microservices, and how do you mitigate them? ⸻ Distributed Transactions / Consistency 16. What is the Saga pattern? 17. Why do we need Saga instead of distributed transactions (2PC)? 18. What are the types of Saga patterns? 19. How do compensating transactions work? 20. What problems can occur in Saga implementations? 21. How do you handle partial failure in a Saga-based system? ⸻ Frontend / React (Senior Level) 22. How do you handle state normalization in frontend applications? 23. How do you manage global state in large React applications? 24. How do you avoid unnecessary re-renders in React? 25. When do you use useMemo, useCallback, React.memo, and when not? 26. How do you design frontend state for performance and scalability? ⸻ DevOps / Deployment / Containers 27. How do you optimize Dockerfiles for production? 28. How do you structure Dockerfiles differently for React frontend vs FastAPI backend? 29. How do you reduce Docker image size and build time? 30. How do you manage multiple microservices Docker builds efficiently? 31. How do you handle configuration and secrets securely in containers? ⸻ Cross-Cutting Architecture Questions 32. How do you design APIs to be fault-tolerant? 33. How do you handle timeouts, retries, and circuit breakers together? 34. How do you prevent cascading failures? 35. How do you balance consistency vs availability in real systems?

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