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Backend Software Engineer Interview Questions

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2,349 backend software engineer interview questions shared by candidates

The online assessment is done on the CodeSignal platform. You have 1 week to take it once you receive the invitation. The test duration is 1 hour and 30 minutes (if I remember correctly). It is proctored, so you must have your camera and microphone on during the entire test. There are 4 coding questions. You must solve them one after another — you can't skip questions or go back to previous ones. All the problems are related to building a transactional tracking system and detecting potential fraud. The focus is on logic, data structures, and clean implementation.
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Senior Software Engineer - Backend

Interviewed at Charlie Health

3.5★
Apr 9, 2025

The online assessment is done on the CodeSignal platform. You have 1 week to take it once you receive the invitation. The test duration is 1 hour and 30 minutes (if I remember correctly). It is proctored, so you must have your camera and microphone on during the entire test. There are 4 coding questions. You must solve them one after another — you can't skip questions or go back to previous ones. All the problems are related to building a transactional tracking system and detecting potential fraud. The focus is on logic, data structures, and clean implementation.

Build a system that books an available seat on a train that has only one line and several stations. You need to ensure there's an available seat for all stations. You can book a ticket from any station to any station.
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Backend Developer - Software Engineer Sr

Interviewed at Palo Alto Networks

3.7★
Aug 12, 2025

Build a system that books an available seat on a train that has only one line and several stations. You need to ensure there's an available seat for all stations. You can book a ticket from any station to any station.

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