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Senior Backend Engineer Interview Questions

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2,042 senior backend engineer interview questions shared by candidates

Describe scenario where requirements handed over to you were not clear, how did you handle the situation Describe. you weakness and vulnerabilities Explain your experience working on distributed systems Experience with Java/C#
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Senior Backend Engineer

Interviewed at C2FO

3.5★
Sep 9, 2021

Describe scenario where requirements handed over to you were not clear, how did you handle the situation Describe. you weakness and vulnerabilities Explain your experience working on distributed systems Experience with Java/C#

League Backend Challenge In main.go you will find a basic web server written in GoLang. It accepts a single request /echo. Extend the webservice with the ability to perform the following operations Given an uploaded csv file 1,2,3 4,5,6 7,8,9 Echo (given) Return the matrix as a string in matrix format. // Expected output 1,2,3 4,5,6 7,8,9 Invert Return the matrix as a string in matrix format where the columns and rows are inverted // Expected output 1,4,7 2,5,8 3,6,9 Flatten Return the matrix as a 1 line string, with values separated by commas. // Expected output 1,2,3,4,5,6,7,8,9 Sum Return the sum of the integers in the matrix // Expected output 45 Multiply Return the product of the integers in the matrix // Expected output 362880 The input file to these functions is a matrix, of any dimension where the number of rows are equal to the number of columns (square). Each value is an integer, and there is no header row. matrix.csv is example valid input. Run web server go run . Send request curl -F 'file=@/path/matrix.csv' "localhost:8080/echo" What we're looking for The solution runs The solution performs all cases correctly The code is easy to read The code is reasonably documented The code is tested The code is robust and handles invalid input and provides helpful error messages
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Senior Software Engineer Backend – (Apps & Solutions)

Interviewed at League

3.6★
Feb 24, 2025

League Backend Challenge In main.go you will find a basic web server written in GoLang. It accepts a single request /echo. Extend the webservice with the ability to perform the following operations Given an uploaded csv file 1,2,3 4,5,6 7,8,9 Echo (given) Return the matrix as a string in matrix format. // Expected output 1,2,3 4,5,6 7,8,9 Invert Return the matrix as a string in matrix format where the columns and rows are inverted // Expected output 1,4,7 2,5,8 3,6,9 Flatten Return the matrix as a 1 line string, with values separated by commas. // Expected output 1,2,3,4,5,6,7,8,9 Sum Return the sum of the integers in the matrix // Expected output 45 Multiply Return the product of the integers in the matrix // Expected output 362880 The input file to these functions is a matrix, of any dimension where the number of rows are equal to the number of columns (square). Each value is an integer, and there is no header row. matrix.csv is example valid input. Run web server go run . Send request curl -F 'file=@/path/matrix.csv' "localhost:8080/echo" What we're looking for The solution runs The solution performs all cases correctly The code is easy to read The code is reasonably documented The code is tested The code is robust and handles invalid input and provides helpful error messages

There is an agreement at the start of code test that the applicant will not copy or share questions/solutions from the test. I will abide by that, but the questions are typical of a site like this HackerRank, which means it's the brain teaser style.
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Senior Backend Engineer

Interviewed at Faire

3.8★
Dec 23, 2020

There is an agreement at the start of code test that the applicant will not copy or share questions/solutions from the test. I will abide by that, but the questions are typical of a site like this HackerRank, which means it's the brain teaser style.

Take home assignment - Pretty easy it's to do with merging and validating paths Feedback round - They will critique your coding assignment, ask some questions to understand your decision making and also extend the problem a little bit they'll update the input parameters slightly but nothing too complicated System design - Simple design around sending and processing payroll slips
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Senior Backend Engineer

Interviewed at PayFit

4.1★
Jul 17, 2024

Take home assignment - Pretty easy it's to do with merging and validating paths Feedback round - They will critique your coding assignment, ask some questions to understand your decision making and also extend the problem a little bit they'll update the input parameters slightly but nothing too complicated System design - Simple design around sending and processing payroll slips

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