Low-Latency Software Engineer : C++/Java : £150-200k+

We're partnering with a leading global trading firm to hire a Low-Latency Software Engineer. This is a rare opportunity to work on ultra-low-latency systems that process market data and execute trades at sub-millisecond speeds — the backbone of high-frequency trading and algorithmic strategies.

The Role

You'll join a small, elite engineering team responsible for:

• Designing and implementing low-latency, high-throughput trading infrastructure in C++ and Java
• Optimising network protocols, messaging systems, and concurrency models for minimal latency
• Developing and maintaining real-time data feeds, order routing, and execution engines
• Profiling, benchmarking, and tuning performance-critical systems down to the nanosecond
• Collaborating with quants, traders, and other engineers to translate strategy requirements into production-grade systems

Tech Stack & Skills

• Languages: C++, Java (C++17/C++20 preferred)
• Concurrency & Multithreading: data structures, atomics, memory ordering
• Networking & Messaging: TCP/UDP, multicast, FIX, ZeroMQ, nanomsg
• Performance & Profiling: Linux perf, cache line optimisation, latency benchmarking
• Familiarity with Linux internals, kernel tuning
• Optional: Python for tooling and scripting

Ideal Candidate

• 3+ years of experience in low-latency systems, trading tech, or high-performance computing
• Deep understanding of CPU architecture, memory hierarchies, and cache optimisation
• Proven track record of building high-throughput, deterministic systems
• Strong problem-solving mindset and attention to detail
• Comfortable working in a high-pressure, fast-moving environment

Why Join?

• Work on systems that operate at the cutting edge of low-latency trading technology
• Collaborate with elite engineers, quants, and traders from leading global markets
• Competitive compensation with performance-linked upside
• Hybrid working in a technology-first, engineering-led culture

If you're passionate about squeezing every nanosecond of performance from software and hardware alike, this is the role for you.