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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # C++ / Rust Systems Engineer (Ultra-Performance Systems) - **Company:** Selby Jennings - **Location:** Greater London, UK - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** Algorithmic Trading, Systems Engineering, C++ (Programming Language), Distributed Systems, Software Architecture, Software Deployment, Computer Networking Systems, Concurrency, Information Technology, Low Latency - **Published:** August 26, 2026 - **Apply:** https://www.collegerecruiter.com/job/2815181365-c--rust-systems-engineer-ultra-performance-systems ## About the Role This is an environment where strong reasoning and problem-solving ability are just as important as systems experience. You will be expected to tackle ambiguous problems, make architectural decisions, and iterate quickly., * 3+ years' experience building high-performance production systems * Strong proficiency in C++ or Rust (or willingness to transition to Rust) * Deep understanding of systems concepts (memory, concurrency, networking, hardware interaction) * Proven track record working on latency-sensitive or high-throughput systems * Strong problem-solving ability and capacity to reason through complex, novel scenarios * High ownership mindset with the ability to operate in an ambiguous, fast-changing environment, * Experience in high-performance domains such as trading systems, distributed systems, or large-scale infrastructure * Background in competitive programming, advanced simulations, or complex algorithmic problem-solving * Strong academic background in Computer Science, Mathematics, Physics, or a related field ## Description We are working with a highly technical, fast-growing engineering team building latency-critical, high-throughput systems in a competitive and fast-moving environment. This is a greenfield opportunity within a small, elite team where engineers take full ownership of systems from design through to production. The Role You will design, build, and optimise high-performance systems where efficiency, scalability, and reliability are critical. The work is deeply technical and spans the full stack, from low-level systems and networking through to algorithmic performance and optimisation. This is an environment where strong reasoning and problem-solving ability are just as important as systems experience. You will be expected to tackle ambiguous problems, make architectural decisions, and iterate quickly. Key Responsibilities: * Design and develop high-performance, low-latency systems in C++ or Rust * Optimise systems for throughput, latency, and scalability * Work across the full lifecycle: architecture, implementation, testing, and production deployment * Analyse and improve system performance through profiling and benchmarking * Solve complex, non-obvious technical problems in a fast-paced environment * Collaborate in a small, high-calibre team with significant ownership and impact Requirements: * 3+ years' experience building high-performance production systems * Strong proficiency in C++ or Rust (or willingness to transition to Rust) * Deep understanding of systems concepts (memory, concurrency, networking, hardware interaction) * Proven track record working on latency-sensitive or high-throughput systems * Strong problem-solving ability and capacity to reason through complex, novel scenarios * High ownership mindset with the ability to operate in an ambiguous, fast-changing environment Preferred Background: * Experience in high-performance domains such as trading systems, distributed systems, or large-scale infrastructure * Background in competitive programming, advanced simulations, or complex algorithmic problem-solving * Strong academic background in Computer Science, Mathematics, Physics, or a related field Why This Role: * Greenfield environment with significant influence over system design and direction * Small, high-performing team with strong technical standards * Fast iteration cycles and immediate impact of your work * Opportunity to take full ownership of critical systems ## Related Videos - [Microservices architecture as a key element in building trading systems for global finance markets](https://www.wearedevelopers.com/videos/1196-microservices-architecture-as-a-key-element-in-building-trading-systems-for-global-finance-markets) - [Rust Beyond Systems: Revolutionizing Web Development](https://www.wearedevelopers.com/videos/1111-rust-beyond-systems-revolutionizing-web-development) - [Concurrency with Go](https://www.wearedevelopers.com/videos/191-concurrency-with-go) - [Swapping Low Latency Data Storage Under High Load](https://www.wearedevelopers.com/videos/746-swapping-low-latency-data-storage-under-high-load) - [C++ in constrained environments](https://www.wearedevelopers.com/videos/441-c-in-constrained-environments) - [WeAreDevelopers LIVE – From JavaScript to WebAssembly, High-Performance Charting and More](https://www.wearedevelopers.com/videos/1794-wearedevelopers-live-from-javascript-to-webassembly-high-performance-charting-and-more) ## Related Articles - [Building AI Solutions with Rust and Docker](https://www.wearedevelopers.com/magazine/494-building-ai-solutions-with-rust-and-docker) - [4 reasons why you should learn Rust in 2021 – and maybe even have fun doing it](https://www.wearedevelopers.com/magazine/35-4-reasons-why-you-should-learn-rust-in-2021-and-maybe-even-have-fun-doing-it) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Top in-demand programming languages to learn in 2021](https://www.wearedevelopers.com/magazine/30-top-in-demand-programming-languages-to-learn-in-2021) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)