Backend Engineer Interview Questions

15,496 backend engineer interview questions shared by candidates

They asked me to build a PHP Command line script that will take an URL (endpoint with an array of events) and two dates and I had to filter the array by the events that were available between those dates. Had 2 hours, I could use frameworks or anything but had to be documented in a Readme.
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PHP Backend Engineer

Interviewed at GetYourGuide

3.1
Mar 31, 2018

They asked me to build a PHP Command line script that will take an URL (endpoint with an array of events) and two dates and I had to filter the array by the events that were available between those dates. Had 2 hours, I could use frameworks or anything but had to be documented in a Readme.

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.

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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