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Senior Backend Engineer Interview Questions

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2,798 senior backend engineer interview questions shared by candidates

Java Questions like: - Difference between a StringBuilder and a StringBuffer - Difference between a ArrayList and LinkedList - hashCode() and equals() Spring Framework and SpringBoot - What is the core foundation of Spring Framework - What is the difference between SpringBoot and Spring Framework - Beans lifecycle - @Autowired annotation - @EnableAutoConfiguration Others - Scalability - CI/CD, what is the CI and what is the CD Databases - Difference between Relational and Non Relational Databases Code Challenge: - Find the longest substring of unique characters in a String
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Senior Java Backend Developer

Interviewed at EPAM Systems

4★
Feb 16, 2026

Java Questions like: - Difference between a StringBuilder and a StringBuffer - Difference between a ArrayList and LinkedList - hashCode() and equals() Spring Framework and SpringBoot - What is the core foundation of Spring Framework - What is the difference between SpringBoot and Spring Framework - Beans lifecycle - @Autowired annotation - @EnableAutoConfiguration Others - Scalability - CI/CD, what is the CI and what is the CD Databases - Difference between Relational and Non Relational Databases Code Challenge: - Find the longest substring of unique characters in a String

I had a very good experience. Each stage was well defined. Before each received Email with all description what to expect and also reference of material to prepare for the interview 1- Screening call with the recruiter 2- First technical round- Interviewer showed me the code snippet and asked to review the code and discuss the improvement 2- 2nd round was System design round, I was show the requirement and based on this I had to design the system , discuss the trade off
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Senior Backend Engineer

Interviewed at Welltech

2.2★
Nov 9, 2025

I had a very good experience. Each stage was well defined. Before each received Email with all description what to expect and also reference of material to prepare for the interview 1- Screening call with the recruiter 2- First technical round- Interviewer showed me the code snippet and asked to review the code and discuss the improvement 2- 2nd round was System design round, I was show the requirement and based on this I had to design the system , discuss the trade off

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