Low-Latency Software Engineer : C++​/Java

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.

• 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
• 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

• 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

• 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

Mid‑Senior level

Full‑time

Information Technology, Engineering, and Finance

Technology, Information and Media, Information Services, and Financial Services

London Area, United Kingdom