Senior C++ Developer

Senior C++ Developer – Oxford (Hybrid, 3 days onsite) £75k to £95k 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 Role You'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 For You'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