Lead Java Developer (Low Latency Trading Systems)
Contract: 4 Months
Rate: Up to £700 per day
Location: Hybrid - London
IR35: Inside IR35
The Opportunity
We are looking for an experienced Lead Java Developer to join a high-performing team delivering strategic Agency Liquidity and Principal Risk initiatives across EMEA and North America. This is an exciting opportunity to work on business-critical trading and risk platforms where performance, scalability and reliability are paramount.
You will play a key role in the design, development and optimisation of ultra-low-latency, high-throughput systems, working alongside traders, quantitative teams and technology stakeholders in a fast-paced front-office environment.
Key Responsibilities
- Design and build high-performance, low-latency Java applications.
- Develop event-driven and reactive systems capable of handling high transaction volumes.
- Optimise application performance through advanced JVM tuning and garbage collection strategies.
- Work on highly concurrent systems with a focus on scalability, resilience and throughput.
- Collaborate with global teams to deliver strategic initiatives across trading and risk platforms.
- Analyse and improve system performance across the full technology stack, from application code to infrastructure.
Required Skills & Experience
- Strong commercial experience with Core Java and low-latency application development.
- Deep understanding of JVM tuning , garbage collection and performance optimisation.
- Expertise in data structures, algorithms and concurrent programming .
- Proven experience building event-driven, reactive and high-frequency systems .
- Strong knowledge of TCP/UDP networking , Linux internals and distributed systems.
- Understanding of CPU architecture, memory management, shared memory and memory-mapped files .
- Experience working with technologies such as JNI, Java Unsafe, JNR-FFI and similar performance-focused frameworks.
- Experience with Aeron messaging technology.
- Background within investment banking, electronic trading, market data, pricing, liquidity or risk platforms .
- Knowledge of front-office trading environments and real-time financial systems.
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Lead Java Developer in London employer: Cpl
Join a dynamic Belfast-based organisation that values its employees and fosters a collaborative work culture. As a Deputy Principal Accountant, you will benefit from professional development opportunities, competitive remuneration, and the chance to lead a talented finance team while contributing to impactful financial governance. This role not only offers a varied and rewarding career path but also allows you to make a meaningful difference in the organisation's financial health.
