Lead Backend Developer Interview Questions

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How would you implement authentication and authorization in a REST API using Python? Explain the difference between multithreading and asynchronous programming in Python. How do transactions work in relational databases? How would you optimize a slow SQL query?
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Backend Developer

Interviewed at EPAM Systems

4
Sep 29, 2025

How would you implement authentication and authorization in a REST API using Python? Explain the difference between multithreading and asynchronous programming in Python. How do transactions work in relational databases? How would you optimize a slow SQL query?

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