Job Description

Posted 2 weeks ago

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