Senior Backend Engineer Interview Questions

2,040 senior backend engineer interview questions shared by candidates

Onsite: 1) Find if left half of a binary tree is mirror image of right half. 2) Theres a text string available that represents a sentence but the spaces between words are missing. Given a dictionary of valid words, recreate sentence with spaces in the right place. (standard question from book 'Cracking the coding interview'. 3) System design question about how to design an ad-server. get and put for ad exchange and keeping track of clicks on an ad. 4) Case study. Gave me a scenario where one of their ad servers is down and users are not seeing ads, given server login access how would you debug.
avatar

Senior Backend Engineer

Interviewed at Spotify

4
Sep 7, 2017

Onsite: 1) Find if left half of a binary tree is mirror image of right half. 2) Theres a text string available that represents a sentence but the spaces between words are missing. Given a dictionary of valid words, recreate sentence with spaces in the right place. (standard question from book 'Cracking the coding interview'. 3) System design question about how to design an ad-server. get and put for ad exchange and keeping track of clicks on an ad. 4) Case study. Gave me a scenario where one of their ad servers is down and users are not seeing ads, given server login access how would you debug.

Phone Interview: Asked about experience and current work. Tech question (on collabedit): Given a small string and a larger string, write a program to fin out if the smaller string can be generated from alphabets in the larger string. Big O complexity and best/worst case analysis.
avatar

Senior Backend Engineer

Interviewed at Spotify

4
Sep 7, 2017

Phone Interview: Asked about experience and current work. Tech question (on collabedit): Given a small string and a larger string, write a program to fin out if the smaller string can be generated from alphabets in the larger string. Big O complexity and best/worst case analysis.

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