Backend Engineer Interview Questions

14,392 backend engineer interview questions shared by candidates

Given unlimited space, build a data-structer that can do: 1. insert any kind of data such as number/charachter 2. remember the order of insertion 3. at any given time, you can get a call that contain a rang to be deleted from the current data you have saved do far(e.g. 100-200) try to accomplish this faster than O(N)
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Backend Engineer

Interviewed at JFrog

4.3
Aug 13, 2019

Given unlimited space, build a data-structer that can do: 1. insert any kind of data such as number/charachter 2. remember the order of insertion 3. at any given time, you can get a call that contain a rang to be deleted from the current data you have saved do far(e.g. 100-200) try to accomplish this faster than O(N)

There were two coding questions and I was given a blank paper. Q1: find digit sum of all the questions till n. eg if n = 12, res = 51 (1+2+...+9 + (1+0) + (1+1) + (1+2)) Q1 was easy and I was able to code it. Q2 was tough here is the question http://stackoverflow.com/questions/11253027/algorithm-to-find-the-total-number-of-connected-sets-in-a-matrix I solved the problem, but was not able to code it properly as it was a long program and I had only paper. I thought i will explain the code later to the interviewer. I got rejected came back and coded both questions at home with same logic. Still dont know why I got rejected.
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Backend Developer

Interviewed at OYO

3.3
Aug 27, 2016

There were two coding questions and I was given a blank paper. Q1: find digit sum of all the questions till n. eg if n = 12, res = 51 (1+2+...+9 + (1+0) + (1+1) + (1+2)) Q1 was easy and I was able to code it. Q2 was tough here is the question http://stackoverflow.com/questions/11253027/algorithm-to-find-the-total-number-of-connected-sets-in-a-matrix I solved the problem, but was not able to code it properly as it was a long program and I had only paper. I thought i will explain the code later to the interviewer. I got rejected came back and coded both questions at home with same logic. Still dont know why I got rejected.

Il est difficile de citer une seule question tant les entretiens furent nombreux et différents, il y a eu des questions sur mon poste actuel, sur mes motivations pour avoir postulé chez Alma, des questions très techniques et enfin des questions générales sur ma personnes lors du team fit. Je pourrais citer la question sur le fait de savoir ce qui m'intéressait dans le poste et pourquoi je postulais dessus.
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Backend Software Engineer

Interviewed at Alma (France)

4
Aug 19, 2025

Il est difficile de citer une seule question tant les entretiens furent nombreux et différents, il y a eu des questions sur mon poste actuel, sur mes motivations pour avoir postulé chez Alma, des questions très techniques et enfin des questions générales sur ma personnes lors du team fit. Je pourrais citer la question sur le fait de savoir ce qui m'intéressait dans le poste et pourquoi je postulais dessus.

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