Job Title: Java/Kotlin Developer (JVM Stack) – UK-Based

Location: UK (Hybrid - UK-based candidates only)

Employment Type: Full-time, Permanent

Salary: £70,000 – £90,000 DOE + benefits

Visa Sponsorship: Not available

About Us:

My client is an innovative and fast-growing fintech company building high-performance, scalable backend systems powering real-world applications used by millions across the UK and Europe. As part of our continued growth, they're looking for a talented a Java/Kotlin Developer to join their backend engineering team and help drive their JVM-based platform forward.

The Role:

You’ll be working as part of a collaborative agile team to design, build, and maintain microservices and backend systems using Java, Kotlin, and the wider JVM ecosystem. This is a hands-on coding role with architectural input, ideal for engineers passionate about clean code, performance, and reliability.

Key Responsibilities:

• Design, develop, and maintain scalable and resilient backend services using Java and Kotlin.
• Leverage the JVM stack to build efficient, concurrent, and fault-tolerant systems.
• Write clean, testable, and well-documented code following best practices.
• Collaborate with cross-functional teams (frontend, DevOps, product) in an agile environment.
• Participate in code reviews, system design discussions, and architectural decisions.
• Continuously improve system performance and reliability.
• Contribute to CI/CD pipeline improvements and deployment strategies.
• Stay up to date with emerging technologies in the JVM and Kotlin ecosystems.

Tech Stack You’ll Work With:

• Languages: Java (11+), Kotlin
• Frameworks: Spring Boot
• Build Tools: Gradle, Maven
• Databases: PostgreSQL, MongoDB
• Messaging/Streaming: Kafka, RabbitMQ
• Cloud: AWS, Docker, Kubernetes
• Testing: JUnit, Mockito, TestContainers
• CI/CD: GitHub Actions, Jenkins, Terraform

What We’re Looking For:

• 5+ years’ experience in backend development using Java and/or Kotlin.
• Strong understanding of the JVM internals, performance tuning, and memory management.
• Solid grasp of microservices architecture and RESTful APIs.
• Experience with cloud platforms, preferably AWS.
• Familiarity with containerisation and orchestration tools (Docker, Kubernetes).
• A passion for building reliable, secure, and high-performance systems.
• Strong problem-solving skills and ability to work independently or in a team.
• Excellent communication skills (written and verbal).

What We Offer:

• Competitive salary with annual bonus
• Remote-friendly and flexible working hours
• 25+ days holiday + bank holidays
• Pension contribution
• Learning and development budget
• Health & wellness support
• Regular team events and conferences (UK & EU)

How to Apply

Click “Apply Now” or send your CV. We aim to respond to all applicants within 7 working days.