Backend Software Interview Questions

15,496 backend software interview questions shared by candidates

Given that you need to call for an external API and it costs X amount of money for each call, how could you waste the minimum amount of money and keep the values up to date? Obs. the values are reliable enough to be kept for 1min. And it has 2% failure rate overall.
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Backend Software Developer

Interviewed at Wise

3.6
May 2, 2022

Given that you need to call for an external API and it costs X amount of money for each call, how could you waste the minimum amount of money and keep the values up to date? Obs. the values are reliable enough to be kept for 1min. And it has 2% failure rate overall.

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.

The interview was all about implementing a Snake Game (LeetCode question 353), give or take, Food location randomness will be talked about in the ending part of the interview. 1) Write (and talk about) a technical design of the game, the data, members, overall functionality. 2) Implement the code over IDE (screen share, not using the internet or AI tools). Food location is a STUB. 3) Draw a design of the food location randomness. Architecture interview: 1) Tell us about a project you implemented in details, prefer something complex that you know all the details about (deep dive). 2) Design in high level (no code) a db like a Redis Cluster, in memory, with persistence, high response time, fault tolerance, etc..
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Senior Backend Engineer

Interviewed at Silverfort

4.4
Feb 1, 2024

The interview was all about implementing a Snake Game (LeetCode question 353), give or take, Food location randomness will be talked about in the ending part of the interview. 1) Write (and talk about) a technical design of the game, the data, members, overall functionality. 2) Implement the code over IDE (screen share, not using the internet or AI tools). Food location is a STUB. 3) Draw a design of the food location randomness. Architecture interview: 1) Tell us about a project you implemented in details, prefer something complex that you know all the details about (deep dive). 2) Design in high level (no code) a db like a Redis Cluster, in memory, with persistence, high response time, fault tolerance, etc..

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