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OB Collective
Java Software Engineer

Java Software Engineer

Hybrid

London, United kingdom

£ 115 /hour

Freelance

22-12-2025

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Skills

Java DevOps Problem-solving Decision-making Attention to detail Architecture Linux

Job Specifications

Java Engineer - Contract (outside IR35)

A Forex Brokerage based in London and are looking for an experienced Java Engineer with strong FIX API (server-side) expertise to join on an initial 3 month contract. This a key role working on high-performance, low-latency trading infrastructure used in live market environments.

What You’ll Be Doing

Design, develop, and maintain server-side Java applications for FIX connectivity
Build and support FIX API integrations with liquidity providers, banks, and trading venues
Optimise systems for low latency, high throughput, and reliability
Collaborate closely with trading, infrastructure, and QA teams
Troubleshoot production issues and contribute to continuous system improvements
Participate in architecture discussions and technical decision-making

What We’re Looking For

Strong commercial experience with Java (server-side)
Proven hands-on experience with FIX Protocol (FIX 4.2/4.4/5.0)
Experience working in Forex, trading, or financial markets environments
Solid understanding of multithreading, concurrency, and performance optimization
Experience with Linux-based systems
Familiarity with low-latency messaging and real-time systems
Strong problem-solving skills and attention to detail

Nice to Have

Experience with FIX engines (e.g. QuickFIX/J or similar)
Knowledge of market connectivity, order routing, or trade execution
Exposure to cloud, containerisation, or DevOps tooling
Understanding of trading platforms and broker infrastructure

More information

3 month initial contract outside of IR35
Rate is up to £800p/d
2-3 days a week in London but might be able to flex on this if an issue

About the Company

We believe working with a delivery partner to build digital products and craft next-gen platforms can be done better. We are passionate about our clients, their problems, and working with the ‘best of the best’ to get it done. At OB Collective we invest time up-front with your team to ensure we can align both culturally and architecturally. From there, we use our best-in-class network to shape the perfect team, who will possess the right maturity, knowledge, and expertise to leave you with sustainable, scalable solutions wi... Know more