Backend Developer Interview Questions

9,196 backend developer interview questions shared by candidates

They asked me two data structure problems — one was to implement a stack using queues and a queue using stacks, both focusing on object-oriented implementation. In the second technical round, they asked the 3-Sum problem, where I had to find all unique triplets in an array that sum up to target.

Backend Developer Intern

Interviewed at Astuto.ai

2.8
Apr 12, 2025

They asked me two data structure problems — one was to implement a stack using queues and a queue using stacks, both focusing on object-oriented implementation. In the second technical round, they asked the 3-Sum problem, where I had to find all unique triplets in an array that sum up to target.

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