Senior Java Developer Low Latency London

Senior Java Developer Low Latency London

Our client is a specialist engineering consultancy known for solving some of the most demanding performance challenges across financial markets and technology. Their teams design, build, and optimise high-throughput, low-latency systems used by global institutions where reliability and speed are critical.

They are now looking for exceptional Java Engineers with proven experience in building high-performance, low-latency systems. This role involves working on complex, business-critical projects where every microsecond matters.

You'll join a highly technical team known for solving tough engineering challenges and delivering efficient, elegant solutions across banking, trading, and financial technology environments.

Location: Primarily Remote, with travel to London City at least twice per week.

Package: Highly competitive base + benefits

What You'll Do

• Design, build, and maintain high-performance Java applications used in demanding real-time systems.
• Develop and enhance testing and benchmarking frameworks to validate system performance.
• Identify and eliminate bottlenecks through systematic performance analysis.
• Contribute ideas and innovations to improve architecture and speed.
• Quantify and document measurable performance improvements.

Requirements:

• Degree-level education (or equivalent experience).
• A strong and proven track record developing low-latency, high-throughput systems on JVM.
• Understanding of JVM internals (GC, threading, concurrency, locking).
• Commercial experience with high-performance Java systems.
• Ability to communicate effectively with both technical and non-technical stakeholders.
• Ability to work confidently across existing and greenfield projects.
• Maintaining a high level of professionalism and precision.
• Exposure to trading, banking or fintech environments is highly beneficial, particularly with front office trading.
• Experience in a software consultancy or client-facing engineering role.