Senior Java Engineer: Low-Latency Systems Expert

JUXT; Greater London; On-site; GBP 90,000 - 150,000; Full time

Job summary

JUXT is seeking Senior and Principal Java Developers to work on a high-performance trading and real-time data project for a major financial institution. You will write and tune Java frameworks, optimise throughput and latency, and apply event-driven, microservice-based architectures.

You will join a team that values clean design, measurable performance, and deep system understanding, contributing to systems that power global trading platforms and real-time data services.

Qualifications

• Strong Java skills with deep knowledge of the JVM.
• Experience building or optimising low-latency systems.
• Proficient with multithreading, memory management and profiling tools.

Responsibilities

• Write and tune high-performance Java frameworks to improve throughput and latency.
• Apply event-driven, microservice-based architectures on mission-critical applications.
• Collaborate with engineers to shape elegant, performance-focused solutions.
• Maintain and improve systems that power real-time trading and data platforms.

Skills

Java

Low-latency systems

Multithreading & concurrency

Performance tuning

Linux fundamentals

Microservices & event-driven

Communication skills

Tools

JMH

async-profiler

Flight Recorder

Kafka tuning

Netty

Chronicle Queue

Aeron

Job description

JUXT is seeking Senior and Principal Java Developers to work on a high-performance trading and real-time data project for a major financial institution. You will write and tune Java frameworks, optimise throughput and latency, and apply event-driven, microservice-based architectures.

You will join a team that values clean design, measurable performance, and deep system understanding, contributing to systems that power global trading platforms and real-time data services.