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Senior Backend Engineer Interview Questions

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2,039 senior backend engineer interview questions shared by candidates

One key question during the interview was a real-world scenario involving query problem-solving. They presented a practical challenge related to the role and asked how I would approach it, ensuring I had hands-on experience and the ability to think critically under real conditions. It was a great way to assess my problem-solving skills and expertise.
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Senior Backend Engineer

Interviewed at Pelcro

4.8★
Mar 12, 2025

One key question during the interview was a real-world scenario involving query problem-solving. They presented a practical challenge related to the role and asked how I would approach it, ensuring I had hands-on experience and the ability to think critically under real conditions. It was a great way to assess my problem-solving skills and expertise.

I'll write down some sample behavior questions they provided. Also, they highly recommend to answer them with STAR method. Scope of Influence: Build Trust, Always be Growing, Be Bold, Disagree and Commit - Disagreeing with your peers or Manager - Have you ever not been able to meet a commitment with a customer/teammate? - How do you look for possible roadblocks within a team setting while working on a project? Do you look 2-4 steps ahead while focusing on your current tasks? Deliver Results: Customer Focus, Growth, Ownership, and Bias for Action - Deal with a difficult customer - What type of obstacles have you overcome during a project or when working towards an important goal? - Have you ever failed before? If so, what was the failure? What did you learn? - Have you taken on something outside of your normal day to day responsibilities?
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Senior Backend Engineer

Interviewed at Mapbox

3.5★
Dec 10, 2022

I'll write down some sample behavior questions they provided. Also, they highly recommend to answer them with STAR method. Scope of Influence: Build Trust, Always be Growing, Be Bold, Disagree and Commit - Disagreeing with your peers or Manager - Have you ever not been able to meet a commitment with a customer/teammate? - How do you look for possible roadblocks within a team setting while working on a project? Do you look 2-4 steps ahead while focusing on your current tasks? Deliver Results: Customer Focus, Growth, Ownership, and Bias for Action - Deal with a difficult customer - What type of obstacles have you overcome during a project or when working towards an important goal? - Have you ever failed before? If so, what was the failure? What did you learn? - Have you taken on something outside of your normal day to day responsibilities?

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.
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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.

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