Senior C++ Engineer

Senior C++ Engineer - High Performance Systems

Oxford (Hybrid), £90k to £95k

Avanti Recruitment is working with a deep‑tech company behind a high‑performance reasoning engine deployed on over 60 million devices worldwide.

This is core engine development for an elite engineering team working on core C++ systems, where performance, correctness, and engineering quality are absolutely critical.

You'll be working on a performance‑critical C++ system, tackling problems around:

• Complex data processing and reasoning
• Concurrency and multithreaded systems
• Memory efficiency and low‑level optimisation
• Cross‑platform behaviour (Linux, Windows, macOS)
• System‑level interactions where required

This is hands‑on, systems‑level engineering.

• 10‑15 years of software development experience
• Strong commercial experience with modern C++ (C++17 or later)
• Background in systems‑level or performance‑critical development
• Solid understanding of multithreading / concurrency
• Comfortable working close to the system (memory, OS behaviour, performance)
• Passion for writing high‑quality, maintainable code

• Experience with low‑level optimisation
• High‑performance backend systems
• Quant / trading systems
• Database or engine development
• Gaming / real‑time systems
• Familiarity with cross‑platform development

• Work on a core product used at global scale
• Strong focus on engineering quality over shortcuts
• Backed by a major global technology organisation, offering stability and long‑term growth

If you're a C++ engineer who enjoys working on complex, high‑performance systems and wants to be part of something genuinely impactful, we'd love to hear from you