Overview

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\'s 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.