Senior Java Engineer - Low-Level Systems | High-Performance Architecture | Hybrid London
I'm working with a leading financial technology organisation building ultra-low latency systems at scale, and we're looking for a Senior Java Engineer with a strong grounding in low-level systems programming .
This is an opportunity to join a high-calibre team of engineers working on the number one tech product in the business, pushing the boundaries of performance and reliability in a demanding, mission-critical environment. The systems you'll help build operate in the microsecond range and demand deep OS, networking, and concurrency knowledge .
?? What You'll Be Working On:
Designing and developing low-latency, high-throughput microservices in Java
Building and refining core components of a proprietary event-driven framework
Working closely with architects, FPGA and infrastructure engineers to optimise performance across the stack
Developing systems with a focus on resilience, fault-tolerance, and scalability
Driving performance improvements with hardware-aware optimisations and kernel-bypass techniques
?? What We're Looking For:
Deep understanding of systems-level programming (Java and/or Rust, C, C++)
Experience with manual memory management, concurrency, and multithreading
Familiarity with Linux internals, system calls, and networking
Bonus points for experience with:
Kernel bypass (Solarflare, DPDK)
Building custom allocators or working in no_std environments
Prior work in trading, real-time systems, or performance-sensitive environments (previous finance experience not crucial)
?? Tech Stack Highlights:
Java, Rust, Linux, GitHub, CI/CD (CircleCI), Docker, TCP/UDP, Playwright (some teams), OpenOnload, AWS
?? The Offer:
Base salary up to ~£130,000 depending on experience
Hybrid working: 2-3 days/week in a London office
Excellent benefits: pension, medical, 27+ days leave, bonus
?? Why This Role:
This is a career-defining opportunity to work on some of the most cutting-edge low-latency systems in the industry. You'll be part of a team that values technical depth, innovation, and clean engineering, all while working on systems where every microsecond counts .
McGregor Boyall is an equal opportunity employer and do not discriminate on any grounds.
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