Job Specifications
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.
What you’ll be working on
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
What we’re looking for
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.
About the Company
Ncounter offer tailored technology recruitment services – enhancing candidate satisfaction levels through the interview process whilst providing companies with a smoother experience from start to finish when hiring. With a wealth of experience, candidates can expect both a listening ear and a technical understanding. Via Ncounter, clients can access a pre-screened talent pool for one-off, team, permanent, contract and consultancy solutions.
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