Senior C++ Software Engineer

Avanti Recruitment is partnering with an innovative deep-tech software company developing high-performance software used by millions of devices worldwide. This is an opportunity to join a small team of exceptional engineers working on the company's core C++ platform. The work is technically demanding, with a strong emphasis on performance, correctness and elegant software design rather than rapid feature delivery. The RoleYou'll be working on the core software platform, solving complex engineering problems involving: • Modern C++ development • High-performance algorithms and data structures • Concurrent and multithreaded programming • Memory management and performance optimisation • Cross-platform software development across Linux, Windows and macOS • Designing and maintaining robust, scalable software at the heart of a globally deployed product This is a hands-on engineering role where you'll spend your time solving difficult technical problems, improving performance and writing clean, maintainable code. You'll be joining a team of experienced software engineers, computer scientists and PhDs who are passionate about solving complex engineering problems. We're Looking ForYou'll ideally have experience with: • Modern C++ (C++17 or later) • Performance-critical or systems-level software • Multithreaded and concurrent programming • Strong computer science fundamentals, including algorithms and data structures • Linux development • Debugging and optimising complex software Experience in any of the following would be advantageous: • Database engines • Compilers • Distributed systems • High-performance backend platforms • Scientific or numerical computing • Graphics, simulation or game engines • Low-latency or real-time systems Why Join? • Work on a sophisticated C++ codebase deployed at global scale • Join a highly experienced engineering team where technical excellence is valued • Tackle genuinely challenging problems in performance, concurrency and software architecture • Influence the evolution of a core product rather than building peripheral features • Hybrid working with an Oxford-based team This role is ideal for engineers who enjoy understanding how software works beneath the surface, care about writing high-quality code, and want to work on technically challenging C++ systems.