Full Stack Engineer

FDJ UNITED; Greater London; On-site; GBP 50,000 - 70,000; Full time

Job summary

FDJ UNITED is seeking a Backend or Full Stack Developer/Engineer to engage in the full system life cycle, focusing on scalable, maintainable services for our customer service back offices. This role offers the opportunity to deepen technical knowledge, work with experienced engineers, and grow into a senior position.

Ideal candidates will have experience with Java, Spring frameworks, REST APIs, and testing frameworks. The role demands strong collaboration, good communication skills, and a willingness to learn and grow.

Qualifications

• Foundational experience as a Backend or Full Stack Developer/Engineer.
• Understanding of frontend and backend connection via REST APIs.
• Experience with testing frameworks like Jest or JUnit.
• Familiarity with CI/CD concepts and version control.

Responsibilities

• Develop and maintain scalable services for customer service back offices.
• Engage in full system/development life cycle from design to production.
• Collaborate and communicate effectively with team members.

Skills

Java fundamentals

Spring or similar frameworks

REST APIs

Version control (Git)

Collaboration

Communication skills

Familiarity with AI-assisted coding tools

Job description

About the role

You'll be involved in the full system/development life cycle from design discussions with your colleagues to the care of our products in production. In this role, you'll develop a deep understanding of how frontend and backend systems interact, while focusing on building scalable, maintainable services to power our customer service back offices.

This is a great role if you're ready to deepen your technical knowledge, learn best practices from experienced engineers, and grow into a senior engineer.

Tech Stack

• Java, Spring, Spring Boot, JMS, Hibernate, JSON, Solace, Spring Cloud Stream
• CSS, UI libraries and HTML
• Oracle, Couchbase
• REST APIs and event‑driven systems

Qualifications

• Have foundational experience working as a Backend or Full Stack Developer/Engineer—you understand Java fundamentals and have worked with Spring or similar frameworks
• Understand how frontend and backend systems connect via REST APIs and can build features that span both layers
• Have used testing frameworks like Jest or JUnit and understand why testing matters
• Have worked with version control (Git) and are familiar with CI/CD concepts like automated testing and deployment pipelines
• Are comfortable troubleshooting code issues and asking for help when needed—you know how to use logs, debugging tools, and your team
• Are eager to learn and grow; you're not afraid to ask questions and take on new challenges in a supportive environment
• Enjoy collaborating with teammates and are open to feedback on your code and approach
• Are a positive person by nature and genuinely enjoy working with others—you see collaboration as a strength
• Have good communication skills; you can explain your ideas clearly and listen to feedback without defensiveness
• Are curious and want to understand not just how to solve a problem, but why the solution works
• Believe you still have a lot to learn, and you approach challenges with humility and enthusiasm
• Are open to trying new tools and approaches to improve your work
• Have used AI‑assisted coding tools (like Cursor, GitHub Copilot, or ChatGPT) to help you write or understand code—you're comfortable with AI as a learning and productivity tool
• Have experience asking AI tools to help debug code, explain concepts, or suggest improvements

Preferred Experience

• Familiarity with event‑driven systems or microservices architecture—even just understanding the concepts
• Have any exposure to secure development practices or tools like OWASP or SNYK