Senior Backend Engineer Interview Questions

2,041 senior backend engineer interview questions shared by candidates

How would you optimise a full stack application fetching lots of data? How would you handle a ticket queue with millions of users? Would you use WebSockets, long polling or SSE to handle this? Explain the tradeoffs.
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Senior Backend Engineer

Interviewed at Tomorrowland (Belgium)

3.8
Jun 24, 2025

How would you optimise a full stack application fetching lots of data? How would you handle a ticket queue with millions of users? Would you use WebSockets, long polling or SSE to handle this? Explain the tradeoffs.

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