Java / Kotlin Developer

Job Title: Java Developer (Kotlin)

Contract: 6 months (Inside IR35) – Extendable

Location: Hybrid - West Sussex (2–3 days per week on-site)

Rate: DOE

Client: Leading Financial Services Organisation

Overview

We are working with a leading financial services client who is looking to engage an experienced Java Developer with strong Kotlin experience to join a high-performing engineering team. This is a critical contract role contributing to the design and delivery of scalable, high-quality backend systems within a complex enterprise environment.

The successful contractor will be working on modernising platforms, building robust APIs, and contributing to solutions that operate at scale in a regulated environment.

Key Responsibilities

• Design, develop, and maintain backend services using Java and Kotlin
• Build and enhance microservices-based architectures
• Develop clean, scalable, and well-tested code following best engineering practices
• Collaborate closely with product managers, architects, and other engineers
• Contribute to system design discussions and technical decision-making
• Ensure performance, security, and reliability of applications
• Work within Agile/Scrum delivery teams

Required Skills & Experience

• 5+ years of commercial software development experience
• Strong expertise in Java and hands-on Kotlin development
• Experience building backend services and APIs
• Solid understanding of microservices architectures
• Experience with Spring / Spring Boot
• Familiarity with CI/CD pipelines and modern development practices
• Strong problem-solving skills and ability to work in complex environments

Desirable Experience

• Previous experience in financial services or regulated industries
• Cloud experience (AWS, Azure, or GCP)
• Experience with containerisation (Docker, Kubernetes)
• Knowledge of event-driven architectures (Kafka, messaging systems)

Contract Details

• Initial 6-month contract, with strong likelihood of extension
• Inside IR35
• Hybrid working: 2–3 days per week on-site
• Competitive day rate dependent on experience