Senior C++ Developer (Hybrid, UK-Based) in London)

Senior C++ Developer (Hybrid, UK-Based)

Location: London

Salary: £80,000 – £100,000 + EMI Share Options + Private Medical Insurance

Vacancy Type: Full-time, Permanent

The Role

Reporting to the Software Development Manager, you’ll lead the design, development, and optimisation of C++ software within our Linux-based timing systems. Day to day, you will:

• Design, build, and optimise low-latency, high-precision C++ at the heart of our timing products – code where performance, determinism, and jitter really matter
• Make architectural decisions on systems that have to be correct, fast, and observable in production – balancing maintainability with the hard real-time constraints of precision timing
• Develop online and offline tooling to support time synchronisation and system monitoring
• Build and maintain automated test cases using Python-based system test frameworks
• Provide senior-level technical input across product, QA, hardware, and commercial conversations
• Share knowledge, review code, and support the development of our junior C++ developer
• Help shape engineering standards, tooling, and processes

Essential Experience

• Extensive professional experience writing modern C++ in production – fluent in modern C++ idioms and confident with C++20/23 features such as concepts, ranges, coroutines, and constant expressions (constexpr/consteval)
• A track record of delivering low-latency, performance-sensitive systems on Linux – production code where determinism, throughput, and tail latency matter
• Strong computer science fundamentals: data structures, algorithms, concurrency, performance optimisation
• Demonstrable ability to design software architecture and make sound technical trade-offs
• Strong debugging and profiling skills (perf, valgrind, sanitizers, flame graphs) – you’ve cared about cache lines, lock contention, jitter, and tail latency, not just correctness
• Confident with Git, CI/CD pipelines, modern build tooling (CMake), and automated testing frameworks
• Clear technical communicator – you can explain trade-offs to engineers and non-engineers alike

Nice to Have

• Linux networking experience (sockets, networking concepts and standard tooling)
• Experience interacting with hardware on Linux (device drivers, system interfaces, low-level I/O)
• Low-level Windows systems development (Windows APIs, system services, platform-specific debugging)
• PostgreSQL or other relational database experience
• Python and/or Go (Golang) for tooling, automation, or supporting services
• Familiarity with time synchronisation protocols such as PTP or NTP
• Open-source contributions or evidence of staying current with the C++ standard
• Open to integrating AI tools where they add value

What We Offer

• Salary of £80,000 – £100,000, depending on experience
• EMI Share Options
• Private Medical Insurance
• Hybrid working – 2 days per week at our London (Shoreditch) office, with regular team events
• Based at a Shoreditch FinTech incubator – a thriving community of like-minded businesses with a full social calendar, networking opportunities, and (importantly) dog-friendly
• Your code will sit underneath MiFID II-compliant trade timestamps at major banks, broadcast sync at tier-1 broadcasters, and timing infrastructure at telecoms operators – tangible, high-stakes impact at global scale
• A team that invests in modern tooling and continuous learning

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