Java Software Engineer

OB Collective; England; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A Forex brokerage in London is seeking an experienced Java Engineer to work on a 3-month contract outside IR35. The successful candidate will design and maintain server-side Java applications for FIX connectivity, supporting integrations with key financial entities. This role requires strong expertise in Java and FIX Protocol, along with experience in low-latency trading environments. Competitive daily rates of up to £800 are offered, with flexibility regarding in-office requirements.

Qualifications

• Strong commercial experience with server-side Java.
• Proven hands-on experience with FIX Protocol.
• Experience in Forex, trading, or financial market environments.

Responsibilities

• Design, develop, and maintain server-side Java applications for FIX connectivity.
• Support FIX API integrations with liquidity providers and trading venues.
• Optimize systems for low latency and high reliability.

Skills

Java (server-side)

FIX Protocol (FIX 4.2 / 4.4 / 5.0)

Multi-threading

Problem-solving

Linux-based systems

Tools

QuickFIX / J

Job description

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