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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