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Software Engineer Backend Interview Questions

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2,350 software engineer backend interview questions shared by candidates

Video call: 1. Find the nth Fibonacci number (iteratively and recursively) 2. Validate if it is a BST or not Onsite: 1. Find overlapping intervals 2. Opentable system design 3. Given an URL, go fetch the JSON from it and modify and result. 4. HR questions.
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Software Engineer, Backend

Interviewed at Keap

3.6★
Apr 7, 2021

Video call: 1. Find the nth Fibonacci number (iteratively and recursively) 2. Validate if it is a BST or not Onsite: 1. Find overlapping intervals 2. Opentable system design 3. Given an URL, go fetch the JSON from it and modify and result. 4. HR questions.

As some people mentioned, it was online assessment then first F2F interview where we discussed how to implement LRU cache and then the loop interview (4 Tech + HR) The loops interviews are not expected to be in order, it was for me : 1) Data Structures: We talked about the time and space complexity for multiple DS and how is hash accessed by the compiler in Java and I had a leetcode question I guess medium 2) Programming: This was a little bit hard, Asked about concurrency,deadlocks mainly and some DS and another medium question for the closest target 3) System Design The interviewer was nice here and we had a discussion for 1 hour about how to implement a monitoring system including High availability and Distrubted system architecture 4) General Knowledge: Many questions about concurrency, threads, networks like communication protocols, security, database multithreading
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Backend Software Engineer

Interviewed at PayPay

3.4★
Oct 14, 2021

As some people mentioned, it was online assessment then first F2F interview where we discussed how to implement LRU cache and then the loop interview (4 Tech + HR) The loops interviews are not expected to be in order, it was for me : 1) Data Structures: We talked about the time and space complexity for multiple DS and how is hash accessed by the compiler in Java and I had a leetcode question I guess medium 2) Programming: This was a little bit hard, Asked about concurrency,deadlocks mainly and some DS and another medium question for the closest target 3) System Design The interviewer was nice here and we had a discussion for 1 hour about how to implement a monitoring system including High availability and Distrubted system architecture 4) General Knowledge: Many questions about concurrency, threads, networks like communication protocols, security, database multithreading

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