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Backend Software Engineer Interview Questions

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2,350 backend software engineer interview questions shared by candidates

Tech team interview breakdown: Section 1: 30 minutes • Introduction: Intro to Form3 and payments. • Code review: Candidate will screen share their code in an IDE of their choice. Review of the code submission, focusing on code tests, design, general code quality and any specific feedback from the code review. Section 2: 30 minutes • Networking: Discussion of network computing covering TCP/IP, HTTP and security. • Remote working: Discussion of past experiences of remote working, challenges, and benefits. • Additional questions (time permitting): Discuss cloud computing, infrastructure as code, distributed systems. Section 3: 30 minutes • Debugging exercise: Candidate will be asked to take part in a simulation and try and debug a problem with the Form3 platform encountered during an on-call shift. • CI / CD: Candidate will be asked to describe how they would build a CI/CD pipe line for their take home test submission. • Candidate questions: Candidate is given time to ask any questions they might have. • CV: General questions from their CV. • Pair programming (time permitting): Quick discussion on how pair programming works at Form3.
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Senior Backend Software Engineer

Interviewed at Form3

3.5★
Jan 12, 2022

Tech team interview breakdown: Section 1: 30 minutes • Introduction: Intro to Form3 and payments. • Code review: Candidate will screen share their code in an IDE of their choice. Review of the code submission, focusing on code tests, design, general code quality and any specific feedback from the code review. Section 2: 30 minutes • Networking: Discussion of network computing covering TCP/IP, HTTP and security. • Remote working: Discussion of past experiences of remote working, challenges, and benefits. • Additional questions (time permitting): Discuss cloud computing, infrastructure as code, distributed systems. Section 3: 30 minutes • Debugging exercise: Candidate will be asked to take part in a simulation and try and debug a problem with the Form3 platform encountered during an on-call shift. • CI / CD: Candidate will be asked to describe how they would build a CI/CD pipe line for their take home test submission. • Candidate questions: Candidate is given time to ask any questions they might have. • CV: General questions from their CV. • Pair programming (time permitting): Quick discussion on how pair programming works at Form3.

for the strange IQ quizzes I can remember: 1. give you two ropes that burns out in one hour, how do you get 45 min precisely from burning them? 2. two gates two guards, one telling truth, one telling lies, how to ask one guard one question so that it leads to treasure; 3. zebra puzzle (they basically have an identical problem listed in the wiki of zebra puzzle but with details changed); 4. 10 piles candies, 9 piles weigh 1 g each, one pile weigh 2 g, how to use scale to find out which one weighs 2 g, and two more upgraded question like x piles weigh 1 g, y piles weigh 2 g, x + y = 10, how do you find 1 g piles.
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Backend Software Engineer

Interviewed at D3 Security Management Systems

3.3★
Aug 2, 2024

for the strange IQ quizzes I can remember: 1. give you two ropes that burns out in one hour, how do you get 45 min precisely from burning them? 2. two gates two guards, one telling truth, one telling lies, how to ask one guard one question so that it leads to treasure; 3. zebra puzzle (they basically have an identical problem listed in the wiki of zebra puzzle but with details changed); 4. 10 piles candies, 9 piles weigh 1 g each, one pile weigh 2 g, how to use scale to find out which one weighs 2 g, and two more upgraded question like x piles weigh 1 g, y piles weigh 2 g, x + y = 10, how do you find 1 g piles.

- Implement a function to filter data. I liked that it was not a basic leet code problem. - Basic leet code problem string compression/decompression exercise. - System's design problem related to a potential feature used at Affirm. - Standard behavioral interview questions.
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Sr. Software Engineer (Backend)

Interviewed at Affirm

4★
Jun 6, 2024

- Implement a function to filter data. I liked that it was not a basic leet code problem. - Basic leet code problem string compression/decompression exercise. - System's design problem related to a potential feature used at Affirm. - Standard behavioral interview questions.

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