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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