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Java Backend Developer Interview Questions

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517 java backend developer 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

Tech Interview Question- OOPS- Abstraction, Inheritance, Polymorphism, Encapsulation. Inheritance VS polymorphism types of polymorphirm overloading, overriding. function on both. Question on ternary operator SQL- Indexing DDL VS DML Normalisation vs denormalisation Sharding SQL queries todo. What to do when db can handle only 100 votes but 1000 are coming from bank. Explain the internship. DSA- Stacks vs Queues. explain Binary Search, time complexity. Merge sort- nlogn divide and conquer. Recursion- Explain, base cases. Work Sample Questions Explain the aproach for the problem statement, Scopes of improvements for project Why Javascript, How can project can handle the multiple inputs, JAVA vs JS, any online tool that does the same job What is nosql, what does DB offer(ACID), why a web application, what is a web app which works on mobile- responsive. Individual contributions, any question(can we change the role), more question on stroage of files. code related question on async js,promises, settimeout, how to fix it, use of global array. optimization, performance, handling huge data, getting out the right data.
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Graduate Backend Developer - Java

Interviewed at BlueOptima

3.3★
Jul 31, 2021

Tech Interview Question- OOPS- Abstraction, Inheritance, Polymorphism, Encapsulation. Inheritance VS polymorphism types of polymorphirm overloading, overriding. function on both. Question on ternary operator SQL- Indexing DDL VS DML Normalisation vs denormalisation Sharding SQL queries todo. What to do when db can handle only 100 votes but 1000 are coming from bank. Explain the internship. DSA- Stacks vs Queues. explain Binary Search, time complexity. Merge sort- nlogn divide and conquer. Recursion- Explain, base cases. Work Sample Questions Explain the aproach for the problem statement, Scopes of improvements for project Why Javascript, How can project can handle the multiple inputs, JAVA vs JS, any online tool that does the same job What is nosql, what does DB offer(ACID), why a web application, what is a web app which works on mobile- responsive. Individual contributions, any question(can we change the role), more question on stroage of files. code related question on async js,promises, settimeout, how to fix it, use of global array. optimization, performance, handling huge data, getting out the right data.

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