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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:
  

• 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:
  
  

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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