Java Backend Developer Interview Questions

Backend Java Developer

Interviewed at Spotify

4★

Sep 4, 2020

1. How JVM works? 2. TreeMap 3. HashMap 4. How GC works internally 5. TCP/UDP differences / applications 6. A live program

Backend Software Developer (Java)

Interviewed at ScienTec Consulting

4.3★

Jun 30, 2024

Can you share bout your previous work experience and projects?

Java Developer - Backend

Interviewed at Brillio

4.1★

Sep 19, 2025

All new features introduced in java 8. OOM Error Some annotations from Spring boot optimise db query design patterns used

Senior Software Engineer- Java( Backend)

Interviewed at Blis

3.7★

Mar 16, 2024

If you run N threads, how many heaps and how many stacks are created inside the JVM?

Senior Software Engineer- Java( Backend)

Interviewed at Blis

3.7★

Mar 16, 2024

Ever find yourself in a situation where the requirement is one line and you have unrealistic timelines? Where would you compromise?

Senior Software Engineer- Java( Backend)

Interviewed at Blis

3.7★

Mar 16, 2024

If you have to build an application from scratch, what are you major concerns?

Senior Software Engineer- Java( Backend)

Interviewed at Blis

3.7★

Mar 16, 2024

Can you describe the architecture of a project your worked on recently? What would you change about it?

Software Engineer - Java Backend

Interviewed at KredX

3★

Feb 3, 2020

Coding ques like: checkIfCompleteBinaryTree(root ), findHeightOfTree(root ), BinarySearch(), BinarySearchInRotatedArray() and their complexity

Java Backend Developer ()

Interviewed at InfinityLabs

4.2★

May 3, 2021

2 coding questions: 1. In an array , value at each index would be multiplication of all values present at other indexes. Eg. Input : [3,4,5] => Output: [20,15,12] 2. Print first non-repetitive character in a string?

Backend Java Developer

Interviewed at Sifars

4★

Oct 19, 2021

Questions were asked on Collections, lambda expressions, functional interfaces, oops concepts, springboot, rest services, annotations, sql queries and so on One of the three puzzles asked was There is pond which has lotus flowers in it. Each day the flowers count gets doubled. If the pond get full in 20 days, how many days will it take to fill half of the pond?