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Caspian One
Java Swing Developer

Java Swing Developer

Hybrid

London, United kingdom

£ 106 /hour

Freelance

12-01-2026

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Skills

Java Risk Management Sales Architecture Microservices

Job Specifications

Senior Java Swing Developer –

About the Role

We’re looking for a Java Swing Developer to join a team working on a high-performance desktop trading platform. Working on a mission-critical system that supports FX Cash, deposits, futures, swaps, and more. The platform is rich in functionality, handles heavy loads with low latency, and underpins key trading and sales workflows.

You’ll help maintain and evolve the current Java Swing UI, while preparing for a future transition to a modern microservices-based architecture. This role offers exposure to complex, real-time systems and the chance to influence the next generation of our technology stack.

What You’ll Do

Enhance and maintain a Java Swing-based UI for trading and risk management.
Work on a multithreaded, high-memory architecture communicating with backend via bespoke TCP.
Collaborate on plans to decouple UI and introduce microservices.

What We’re Looking For

Strong Core Java skills and solid understanding of design patterns.
Ability to work with multithreaded architectures and optimise performance.
Java Swing experience
Familiarity with microservices concepts and willingness to transition into modern architecture.

Nice to Have

Knowledge of FX, fixed income, and derivatives products.
Experience with OMS, algo trading, and FIX protocols.

About the Company

Caspian One are an international professional services company. We solve technology-driven, resource-based and project-delivery challenges that demand speed, scale and commercial flexibility. Empowering individuals and organisations to optimise their full potential. Put simply – we deploy specialist resources and niche technology teams to deliver projects in ways that best suit the needs of our clients. These SMEs are working to decommission, migrate, build, and implement tech that gives our clients the competitive edge. ... Know more