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Senior Backend Developer Interview Questions

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1,024 senior backend developer interview questions shared by candidates

Questions on Resume, Binary search and duplicate elements, indexing vs primary key, JDBC, ORM, postgres specific, sql injection, triggers and stored procedures, dependency injection, Microservices questions ,Volatile, syncronized
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Senior Backend Developer

Interviewed at ZeMoSo

3.9★
May 11, 2020

Questions on Resume, Binary search and duplicate elements, indexing vs primary key, JDBC, ORM, postgres specific, sql injection, triggers and stored procedures, dependency injection, Microservices questions ,Volatile, syncronized

""" You are given a matrix as a list of lists, where the inner lists are the matrix rows. This is known as row-major format. Write a function sort_matrix(matrix, by_row) that sorts the matrix by an arbitrary row, such that the columns move along accordingly, when you sort by a certain column. * Don't use any imports or libraries. * Don't transpose the matrix! Example: For the matrix matrix = [[7, 0, 8, 2, 6], [1, 3, 0, 2, 4], [5, 4, 3, 2, 1]] we get: sort by row 0 [0, 2, 6, 7, 8] <- sorted row [3, 2, 4, 1, 0] <- columns moved by sorting – e.g. column (0,3,4) stay together [4, 2, 1, 5, 3] <- columns moved by sorting sort by row 1 [8, 7, 2, 0, 6] [0, 1, 2, 3, 4] <- sorted row [3, 5, 2, 4, 1] sort by row 2 [6, 2, 8, 0, 7] [4, 2, 0, 3, 1] [1, 2, 3, 4, 5] <- sorted row """
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Senior Backend Developer

Interviewed at Babbel

3.5★
Jul 11, 2023

""" You are given a matrix as a list of lists, where the inner lists are the matrix rows. This is known as row-major format. Write a function sort_matrix(matrix, by_row) that sorts the matrix by an arbitrary row, such that the columns move along accordingly, when you sort by a certain column. * Don't use any imports or libraries. * Don't transpose the matrix! Example: For the matrix matrix = [[7, 0, 8, 2, 6], [1, 3, 0, 2, 4], [5, 4, 3, 2, 1]] we get: sort by row 0 [0, 2, 6, 7, 8] <- sorted row [3, 2, 4, 1, 0] <- columns moved by sorting – e.g. column (0,3,4) stay together [4, 2, 1, 5, 3] <- columns moved by sorting sort by row 1 [8, 7, 2, 0, 6] [0, 1, 2, 3, 4] <- sorted row [3, 5, 2, 4, 1] sort by row 2 [6, 2, 8, 0, 7] [4, 2, 0, 3, 1] [1, 2, 3, 4, 5] <- sorted row """

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