Senior C++ Developer

Senior C++ Developer - High-Performance Messaging Systems

£180,000-£200,000 | London | Hybrid

Ncounter is supporting the growth of a high‑performing engineering team responsible for building and evolving one of the most sophisticated messaging platforms in the capital markets space. This is a senior‑level C++ role focused on performance, reliability, and scale, sitting at the heart of a globally distributed trading environment.

You’ll take ownership of a large, in‑house C++ codebase that underpins hundreds of applications and mission‑critical data flows. The work is deeply technical, solving problems around low latency, throughput, concurrency, and resilience, while operating in a predominantly Linux environment with Python used for tooling, libraries, and integration.

• Designing and enhancing high‑performance C++ messaging libraries used across global trading systems
• Optimising multithreaded, low‑latency components in Linux environments
• Supporting and evolving APIs used by teams working in C++, Python, and other languages
• Working closely with infrastructure and platform teams to ensure reliability at scale
• Troubleshooting, testing, and performance tuning across complex distributed systems

• Strong commercial experience in modern C++ within performance‑critical systems
• Deep understanding of Linux, including deployment, debugging, and runtime behaviour
• Practical Python experience for scripting, tooling, or API interaction
• Experience building or supporting high‑throughput, low‑latency platforms
• Solid grounding in concurrency, memory management, and systems‑level problem solving

This is a genuinely technical role with real ownership, long‑term scope, and exposure to complex engineering challenges that few environments can offer.

If you’re a senior C++ engineer who enjoys working close to the metal, values clean systems design, and wants to build technology that truly matters, get in touch with Ncounter for a confidential conversation.