Senior Java Developer Interview Questions

Sr Java/Spring Developer

Interviewed at Decathlon

4★

Jun 19, 2025

How would you design a scalable and thread-safe service to handle high-concurrency transactions in a Spring Boot microservices architecture?

Senior Java Developer

Interviewed at Revolut

4★

Aug 28, 2025

Live coding + some questions about complexity of the solution. Load balancer. Some extra requirements once you implement the previous ones. Money transfer service, then SQL query of money transfer, then theory about DB mostly (ACID, isolation levels).

Senior Java Developer

Interviewed at NTT DATA

3.7★

Jul 9, 2024

Java 8 Features: What are lambda expressions in Java? Provide an example. Explain the Stream API and its benefits. What are default methods in interfaces? Memory Management: How does garbage collection work in Java? Explain the difference between stack and heap memory.

Senior Java Developer

Interviewed at Revolut

4★

Jul 6, 2020

cqrs

Senior Java Developer

Interviewed at Revolut

4★

Jul 6, 2020

Working with random String generators

Senior Java Developer

Interviewed at Aspire Systems

3.9★

Aug 14, 2020

oops and sql queries basic

Senior Java Developer

Interviewed at Zensar Technologies

3.7★

May 15, 2016

1. soap vs Rest web services 2. Why ORM ? 3. Spring AOP

Senior Java Developer

Interviewed at Lloyds Banking Group

3.6★

Jun 15, 2016

What did you do in your previous job?

Senior Java Developer

Interviewed at CMC Markets

2.7★

Feb 3, 2020

How to create a structure that stores word occurrences in a sorted manner - the words are read from a file.

Senior Java Developer - Dell Services

Interviewed at Dell Technologies

3.7★

Jun 11, 2014

Nothing in specific I remember which was difficult from my perspective.