Senior Java Engineer

Salary: £40,000 - 70,000 per year

Requirements:

• Expert-level knowledge of Java 21 and the Spring Boot 3.6 framework.
• Proven experience designing, building, and maintaining complex distributed systems and microservices architectures.
• Strong hands-on experience with cloud platforms, specifically AWS, and containerization technologies like Kubernetes (EKS).
• A solid understanding of the full development lifecycle, including packaging (Maven), testing (JUnit, Mockito, Cucumber), and deployment (Argo CD).
• Familiarity with agentic AI, code generation tools, or a strong personal interest and side projects in this area.
• Experience in the financial services industry, particularly with systems related to debit/credit cards, is highly desirable.

Responsibilities:

• Develop and enhance backend microservices using Java and Spring Boot.
• Work on a project migrating business banking customers to a new commercial platform.
• Champion the adoption of agentic AI and spec-based development to accelerate our software delivery lifecycle.
• Refactor existing Java applications to make them suitable for AI-powered code generation and improvement.
• Mentor and guide a team of junior developers, providing clear frameworks and patterns for them to follow.
• Design and build robust backend-for-frontend (BFF) services to support our web and mobile applications.
• Collaborate with cross-functional teams to define, design, and ship new features.

Technologies:

• Agentic AI
• AI
• AWS
• Backend
• Cloud
• Cucumber
• Frontend
• Support
• JUnit
• Java
• Kubernetes
• Maven
• Mobile
• Spring
• Spring Boot
• Web
• microservices
• Network
• Security

More:

We are undertaking a critical digital transformation project to migrate our business banking customers from a legacy retail product to our modern commercial platform. We are seeking two highly skilled Senior Java Engineers for an initial 3-6 month contract in London, UK, with on-site presence required. This is a hands-on role with a strategic focus, where we are building the foundations for a new microservices architecture and moving toward a more automated, spec-based development approach using agentic AI for code generation. We are looking for someone who can help improve the velocity of our development teams while creating patterns and frameworks that junior developers can follow.

last updated 38 week of 2026