Selby Jennings
C++ / Rust Systems Engineer (Ultra-Performance Systems)
Skills
1 month ago
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Important information
Contract type:
Permanent
Location:
London, UK
Work mode:
Onsite
Published on:
22 September 2026
What they need
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
Apply Now!
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