Java Backend Developer Interview Questions

Junior Java Backend Developer

Interviewed at Oracle

3.5★

Oct 23, 2024

Tell me about a situation when you failed at your job.

Java Backend Development Engineer

Interviewed at Siemens

4.1★

Apr 28, 2022

I got an online technical interview to discuss technical knowledge. - What is the SQL injection? - The Principles of a REST Architecture - the difference between vector and LinkedList and ArrayList

Backend Java Developer

Interviewed at Deloitte

3.8★

May 11, 2025

String manipulation questions and streams coding questions

Java Backend Developer ()

Interviewed at Deutsche Bank

3.8★

Sep 28, 2022

What is a constructor? What is IoC? How do you inject a bean? What is the static keyword? How does it work in the back? Why is main method static? How does Spring inject beans in the back?

Senior Java Backend Engineer

Interviewed at Deutsche Bank

3.8★

Jan 27, 2026

API was responding in 2 ms earlier, now it takes 80 seconds. As a Lead, how will you find the issue?

Java Backend Engineer

Interviewed at Société Générale

3.7★

Feb 21, 2026

Find the target sum in an array. pring the target with index. Level order traversal in a tree. Java 8 stream sql question

Senior Java Backend Engineer

Interviewed at MSCI

4★

Mar 21, 2021

Print out Fibonacci numbers from 1 to 100

Backend Developer Java

Interviewed at Viber

4.4★

Apr 20, 2025

1. How to implement a URL shortener (in memory) and how to solve duplicated URLs or collision if using hashing. 2. How to sort an array of ages (between 0 and 120 years)

Senior Backend Engineer-Java

Interviewed at Canva

3.9★

Apr 26, 2025

Typical data structure / algorithm, system design and behavioral interview questions

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.