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# Senior Back End Engineer

- **Company:** Addition Solutions Ltd
- **Location:** London, UK (Remote available)
- **Experience:** Expert
- **Salary:** £123,500.0
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Java (Programming Language), Code Review, Systems Integration, Spring-boot, Software Application Programming, Backend, Restful APIs, Microservices
- **Published:** September 30, 2026
- **Apply:** https://www.reed.co.uk/jobs/senior-back-end-engineer/57403506

## About the Role

We're partnering with a fast-paced, technology-led organisation to appoint an experienced Backend Developer on a fully remote contract.

This is an excellent opportunity for a hands-on developer with strong Java and Spring Boot experience to build and develop scalable backend systems within a high-volume engineering environment.

We're particularly interested in candidates with previous experience in iGaming, betting, FinTech or another sector where reliability, scalability and performance are critical.

The Opportunity

As Backend Developer, you'll work as part of an established engineering team to design, develop and improve backend services and microservice-based applications.

You'll use Java and Spring Boot to create reliable, scalable solutions, develop REST APIs and support systems handling high volumes of activity.

This is a hands-on contract suited to someone who can work effectively at pace, contribute confidently from the outset and deliver high-quality backend solutions within a complex technical environment., You'll be an experienced Backend Developer with strong hands-on Java and Spring Boot expertise and a proven ability to deliver scalable backend solutions.

You will also have:

 * Strong commercial experience developing applications with Java and Spring Boot.

 * Proven backend-development experience within a microservices environment.

 * Experience designing, developing and integrating REST APIs.

 * Experience working with high-volume, scalable systems.

 * Strong problem-solving and troubleshooting capabilities.

 * The ability to produce clean, reliable and maintainable code.

 * The confidence to work independently within a fast-moving remote engineering environment.

 * Strong communication and collaboration skills.

Experience within iGaming, betting or FinTech would be highly advantageous.

## Description

You'll support the development and improvement of scalable backend systems by:

 * Designing, developing and maintaining backend services using Java and Spring Boot.

 * Building and enhancing microservice-based applications.

 * Developing and integrating secure, reliable REST APIs.

 * Supporting the performance, reliability and scalability of high-volume systems.

 * Producing clean, maintainable and well-tested code.

 * Troubleshooting backend issues and implementing effective technical solutions.

 * Collaborating with other engineers and technical stakeholders throughout the development lifecycle.

 * Contributing to technical discussions, code reviews and wider engineering best practices.