Developer Java Backend Interview Questions

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 Engineer

Interviewed at Hypixel Studios

3.9★

Jan 26, 2022

What games do you play?

Senior Backend Engineer-Java

Interviewed at SplitMetrics

4.1★

May 29, 2025

What was the most important task that you've done and you are proud of?

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?

Senior Java Backend Engineer

Interviewed at Sporty Group

4★

Apr 12, 2024

Improve a SQL query after discovering that it's slow

Java Backend Developer

Interviewed at Sporty Group

4★

Nov 11, 2025

1. What data structures do you know? 2. Microservice vs. monolith - which one is better? 3. How can services communicate with each other? 4. What is your favourite design pattern and why?

Java Backend Developer - L4

Interviewed at Deliveroo

3.4★

May 20, 2024

java corn parser sell 6M burger in 10 mins

Junior Java Backend Developer

Interviewed at Standard Chartered Bank

3.7★

Jan 31, 2025

Why do you think you're suitable for this position?

Java Backend Engineer

Interviewed at American Express

4.1★

Jun 6, 2024

Difference between query param and path param