Senior Java Developers - Aeron

Oliver Bernard; Greater London; Hybrid; GBP 117,000 - 195,000; Full time

Benefits offered by this job

Hybrid working

2 days in London per week

Performance-driven environment

Job summary

Oliver Bernard is seeking a Senior Java Developer in London to join a high-performance team building latency-sensitive systems. You will own ultra-low-latency Java applications, work with Aeron messaging, and optimize JVM performance and memory usage.

This role emphasizes concurrency, profiling and delivering measurable throughput improvements. The position supports hybrid work with 2 days in the office per week, and requires deep Aeron knowledge, experience with cluster/archive, and a track

Qualifications

• Proven Java expertise with a focus on low-latency systems.
• Hands-on Aeron experience including cluster/archive.
• Strong JVM performance tuning and memory management knowledge.

Responsibilities

• Design, develop and optimize ultra-low-latency Java apps.
• Build high-performance messaging with Aeron.
• Profile, benchmark and tune to reduce latency and GC overhead.
• Develop highly concurrent, multithreaded systems with predictable performance.
• Optimize JVM behavior and memory management for throughput.
• Collaborate with architects to deliver scalable, high-throughput solutions.
• Identify bottlenecks and drive continuous improvements.
• Contribute to design decisions and code quality standards.
• Demonstrate hands-on Aeron, including cluster/archive usage.
• Design high-throughput, low-latency systems with robust architectures.
• Understand CPU cache, memory barriers and hardware-aware tuning.

Skills

Java

Aeron

Low-latency design

JVM tuning

Multithreading

Profiling

Aeron Cluster

Aeron Archive

Chronicle

Disruptor

Tools

Aeron Cluster

Aeron Archive

Chronicle

Disruptor

Job description

Senior Java Developers- Low Latency / Aeron

Location: London (2 days per week in the office)

Salary: Up to £195,000

Overview

We're looking for an exceptional Senior Java Developer with strong Aeron and low-latency engineering experience to join a high-performance technology team building cutting-edge, latency-sensitive systems.

This is an opportunity for an experienced Java engineer to work on highly concurrent, performance-critical applications where speed, reliability and efficient system design are paramount.

The ideal candidate will have deep expertise in Java, hands-on experience with Aeron, and a strong understanding of JVM performance optimisation and low-latency system architecture.

Key Responsibilities

• Design, develop and optimise ultra-low-latency Java applications.
• Build high-performance messaging and communication systems using Aeron.
• Profile, benchmark and tune applications to minimise latency, garbage collection and CPU overhead.
• Develop highly concurrent, multithreaded systems with predictable performance.
• Optimise JVM behaviour, memory management, object allocation and garbage collection.
• Work closely with architects and other engineers to deliver scalable, resilient and high-throughput solutions.
• Investigate complex performance bottlenecks and drive continuous improvements.
• Contribute to technical design decisions, code quality and engineering best practices.
• Proven, hands-on experience with Aeron, ideally including Aeron Cluster and/or Aeron Archive.
• Strong experience designing and developing low-latency, high-throughput systems.
• Excellent understanding of JVM internals, garbage collection, memory allocation and performance tuning.
• Strong knowledge of multithreading, concurrency, lock-free programming and CPU-level performance optimisation.
• Experience with profiling, benchmarking and performance analysis.
• Solid understanding of network protocols, messaging architectures and distributed systems.
• A strong engineering mindset, with a focus on measurable performance improvements and clean, maintainable code.
• Experience in electronic trading, capital markets or other latency-sensitive environments.
• Familiarity with Linux performance tuning and operating system internals.
• Knowledge of CPU cache behaviour, memory barriers, mechanical sympathy and hardware-aware optimisation.
• Experience with Chronicle, Disruptor or similar high-performance technologies.
• Familiarity with network-level optimisation and efficient binary protocols.

What’s on Offer?

• Salary up to £195,000, depending on experience.
• Hybrid working, with 2 days per week in London.
• The opportunity to work on technically challenging, performance-critical systems.
• A high-calibre engineering environment where technical expertise and innovation are valued.

Interested?

If you're a Senior Java Developer with deep Aeron knowledge and a passion for pushing the boundaries of low-latency performance, we'd love to hear from you.