Senior/Principal Java Engineer - Low Latency

We're looking for Senior and Principal Java Developers with a strong background in low‑latency systems to join us on a high‑performance trading and real‑time data project, for a major financial institution.

You’ll be joining an environment where good software engineering truly matters 6 where clean design, measurable performance, and deep system understanding are valued. This is an opportunity to work alongside recognised low‑latency specialists, elevate your expertise, and contribute to systems that demand precision and technical excellence.

We're looking for developers who are technically exceptional, but also pragmatic 6 engineers who love to understand how things work under the hood, measure performance precisely, and continuously refine their craft.

Responsibilities

You’ll work on mission‑critical applications where performance, scalability, and reliability truly matter 6 the kind of systems that power global trading platforms and require a deep understanding of how the JVM and Linux really work. This is an opportunity to bring world‑class engineering principles to projects at the very heart of modern finance.

Your work will focus on writing and tuning high‑performance Java frameworks, improving throughput and latency, and applying event‑driven, microservice‑based architectures. You’ll collaborate closely with other talented engineers, helping to shape elegant solutions to complex, performance‑sensitive problems.

Requirements

Core Skills

• Strong Java skills with deep knowledge of the JVM
• Proven experience building or optimising low‑latency systems
• Familiarity with performance tuning and profiling tools (e.g. JMH, async‑profiler, Flight Recorder)
• Solid understanding of multithreading, concurrency, and memory management
• Experience with microservice architectures and event‑driven systems
• Strong Linux fundamentals and comfort with performance diagnostics
• Clear communication skills and ability to articulate design and performance decisions

Nice to have

• Experience with high‑performance messaging (Chronicle Queue/Wire, Aeron, ZeroMQ, Kafka tuning)
• Familiarity with off‑heap or direct memory structures (Chronicle Map, VarHandles, DirectByteBuffers)
• Networking/I/O frameworks such as Netty or custom FIX engines
• Exposure to OpenHFT, LMAX Disruptor, or similar performance‑focused frameworks
• Prior experience in trading, financial markets, or real‑time data systems
• Ability to produce clear, lightweight documentation or UML diagrams when needed

We offer

• Opportunity to work on bleeding‑edge projects
• Work with a highly motivated and dedicated team