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Java Backend Engineer Interview Questions

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486 java backend engineer interview questions shared by candidates

Java coding challenge, they'll give you a repo for you to clone it and record yourself throughout the process. It's a restful java app with springboot, expect flyway to initialize it and tons of unit tests to be implemented. Basic stuff to update and delete an entity. You should be really sharp with java unit tests and spring boot tests because it takes the bulk of this challenge.
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Java Backend Engineer

Interviewed at Fullstack Labs

3.9★
Jul 14, 2022

Java coding challenge, they'll give you a repo for you to clone it and record yourself throughout the process. It's a restful java app with springboot, expect flyway to initialize it and tons of unit tests to be implemented. Basic stuff to update and delete an entity. You should be really sharp with java unit tests and spring boot tests because it takes the bulk of this challenge.

1. difference between hashmap and hashset? 2.Internal working of get method in hashmap? 3. Various memory leaks in Java? 4.Reflection API 5. How springboot can return both json and sql format? 6. How Dispatcher Servlet Initialised write a program? 7. One Stream Program Exercise. 8. All possible stringspermutations by a single string?
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Java Backend Engineer

Interviewed at ZeMoSo

3.9★
Sep 24, 2025

1. difference between hashmap and hashset? 2.Internal working of get method in hashmap? 3. Various memory leaks in Java? 4.Reflection API 5. How springboot can return both json and sql format? 6. How Dispatcher Servlet Initialised write a program? 7. One Stream Program Exercise. 8. All possible stringspermutations by a single string?

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