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.

The Role

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.

Skills required

• 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

Bonus points

• 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

What Makes This Role Different

• 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.