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Lead Backend Developer Interview Questions

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9,373 lead backend developer interview questions shared by candidates

Online assessment  Question 1: Find the largest continuous subsequence from the given array {4,4,5} and {6,7,8,9,9,9} answer will be 6 (Easy). Question 2: Formatting the file, read/write operation (Easy) Followed by a technical interview with the Tech Lead Question 1: Find the number which does not repeat, O(n) if the numbers are not in sorted form, O(logn) if the numbers are in sorted form. [1,1,2,3,3,4,4]  Question 2: https://www.spoj.com/problems/AGGRCOW/ The stalls and cows were replaced by houses and parties.
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Backend Developer

Interviewed at Sureify

4.2★
Sep 3, 2021

Online assessment  Question 1: Find the largest continuous subsequence from the given array {4,4,5} and {6,7,8,9,9,9} answer will be 6 (Easy). Question 2: Formatting the file, read/write operation (Easy) Followed by a technical interview with the Tech Lead Question 1: Find the number which does not repeat, O(n) if the numbers are not in sorted form, O(logn) if the numbers are in sorted form. [1,1,2,3,3,4,4]  Question 2: https://www.spoj.com/problems/AGGRCOW/ The stalls and cows were replaced by houses and parties.

The online assessment is done on the CodeSignal platform. You have 1 week to take it once you receive the invitation. The test duration is 1 hour and 30 minutes (if I remember correctly). It is proctored, so you must have your camera and microphone on during the entire test. There are 4 coding questions. You must solve them one after another — you can't skip questions or go back to previous ones. All the problems are related to building a transactional tracking system and detecting potential fraud. The focus is on logic, data structures, and clean implementation.
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Senior Software Engineer - Backend

Interviewed at Charlie Health

3.5★
Apr 9, 2025

The online assessment is done on the CodeSignal platform. You have 1 week to take it once you receive the invitation. The test duration is 1 hour and 30 minutes (if I remember correctly). It is proctored, so you must have your camera and microphone on during the entire test. There are 4 coding questions. You must solve them one after another — you can't skip questions or go back to previous ones. All the problems are related to building a transactional tracking system and detecting potential fraud. The focus is on logic, data structures, and clean implementation.

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