Java Backend Engineer Interview Questions

Java Backend Developer

Interviewed at BairesDev

4.2★

Feb 15, 2023

Apenas perguntas sobre trabalho atual, experiências com ferramentas relacionadas. Entrevista técnica voltada unicamente ao ecossistema Java e Spring. Não há pegadinhas nem perguntas parecidas com leetcode/hackerrank.

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 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

Java Backend Development Engineer

Interviewed at Siemens

4★

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

Java Backend Developer ()

Interviewed at Wissen Infotech

3.8★

Jan 14, 2021

1. Difference between Arraylist and linkedlist. 2. What is the time complexity of insertion in linkedlist? 3. Which one do you prefer in which condition? 4. Which one do you use to insert an array of integers? 5. Given two lists - remove all the elements of second list from first list. 6. Employee class - Employee1 emp1 = ID:1, name : ABC Employee2 emp2 = ID:1, name : ABC Treemap map = new TreeMap<>(); map.put(emp1,7); map.put(emp2,8); Is this allowed? What will be the size of the treemap in this case? 7. Internal implementation of put method in treemap. 8. Internal implementation of hashcode and equals in object class. 9. Time complexity of removeAll() in Linkedlist

Senior Java Backend Engineer

Interviewed at MSCI

4★

Mar 21, 2021

Print out Fibonacci numbers from 1 to 100

Backend Java Developer

Interviewed at Deloitte

3.8★

May 11, 2025

String manipulation questions and streams coding questions

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?

Backend Developer Java

Interviewed at Viber

4.3★

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)

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?