Senior C++ Engineer
CV-LibraryOxford, OxfordshirepermanentPosted: 1 May 2026
Apply NowSenior 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
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