Senior Java/Aeron Engineers

Senior Java Developer – Aeron & Low-Latency Systems

Location: 2 days a week in London

Employment Type: Full-time or Outside IR35 Contract

About the Role

We are seeking an experienced Senior Java Developers to join an engineering team and work on high-performance, low-latency systems using Java and Aeron.

This is an opportunity to contribute to the design, development, and optimisation of mission-critical software where performance, reliability, and efficiency are essential. You will work alongside talented engineers to build scalable, event-driven solutions and solve complex technical challenges.

Key Responsibilities

• Design, develop, and maintain high-performance Java applications.
• Build and optimise low-latency, high-throughput systems using Aeron.
• Work with Aeron Media Driver, Aeron Cluster, and related messaging technologies.
• Analyse and optimise application performance, latency, memory usage, and garbage collection.
• Develop efficient concurrent and multithreaded software.
• Collaborate with architects, engineers, and stakeholders to deliver robust solutions.
• Write clean, maintainable, and well-tested code.
• Contribute to technical design decisions, code reviews, and engineering best practices.
• Troubleshoot complex production issues and support continuous system improvements.

Essential Skills & Experience

• Strong commercial experience developing software in Java .
• Proven experience working with Aeron or comparable high-performance messaging technologies.
• Solid understanding of low-latency software development and performance optimisation.
• Strong knowledge of Java concurrency, multithreading, and JVM performance tuning.
• Experience with garbage collection, memory management, and efficient data structures.
• Understanding of event-driven architectures and distributed systems.
• Experience with profiling, benchmarking, and performance analysis tools.
• Strong problem-solving skills and the ability to work independently.

Desirable Skills

• Experience with Aeron Cluster, Aeron Archive, or the Aeron Media Driver.
• Knowledge of FIX, financial market data, or electronic trading systems.
• Experience with Linux performance tuning and networking.
• Familiarity with JMH, async-profiler, or similar benchmarking and profiling tools.
• Experience with Test-Driven Development (TDD) and automated testing.
• Understanding of lock-free programming, mechanical sympathy, and zero-copy techniques.

What We Offer

• The opportunity to work on technically challenging, high-performance systems.
• A collaborative engineering environment with experienced developers.
• Opportunities for professional growth and technical ownership.
• Competitive salary and benefits package.
• Flexible working arrangements, depending on location and team requirements