Backend Software Engineer Interview Questions

9,102 backend software engineer interview questions shared by candidates

The exercise of technical interview seemed invented 2 min after interview started. Two interviewers have jumped in without preparing anything. Finally after a wee pause the one of them asked me to provide Scala implementation of a list. When I asked to precise what kind of list he meant, his answer was - immutable linked list.
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Senior Backend Developer

Interviewed at Ledger

3.9
Nov 14, 2018

The exercise of technical interview seemed invented 2 min after interview started. Two interviewers have jumped in without preparing anything. Finally after a wee pause the one of them asked me to provide Scala implementation of a list. When I asked to precise what kind of list he meant, his answer was - immutable linked list.

Online assessment: 5 problems - 2 leetcode hards, 1 relatively easy SQL query, 1 refactor-a-class problem and 1 design problem Technical interview: How do you create a bean? No, I don't mean that. How do you create the bean? What type of bean is it? That's not what scope means (it actually is). Ok, and how does Spring do that in the back? Tell me the implementation.
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Backend Developer

Interviewed at ING

4.1
Oct 12, 2022

Online assessment: 5 problems - 2 leetcode hards, 1 relatively easy SQL query, 1 refactor-a-class problem and 1 design problem Technical interview: How do you create a bean? No, I don't mean that. How do you create the bean? What type of bean is it? That's not what scope means (it actually is). Ok, and how does Spring do that in the back? Tell me the implementation.

Given an array of some elements having some weight - pop out two heaviest elements (x &y) from the array - then compare them until array is empty of there is only one element left comparisons: if x!=y ( push x-y into the array) if x==y ( do nothing)
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Backend Developer

Interviewed at TestMu AI

3.7
Feb 19, 2021

Given an array of some elements having some weight - pop out two heaviest elements (x &y) from the array - then compare them until array is empty of there is only one element left comparisons: if x!=y ( push x-y into the array) if x==y ( do nothing)

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