Low-Latency Java Engineer for Real-Time Trading

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

Job summary

Vallum Associates in London is seeking an experienced Java Engineer specializing in high-performance and low-latency systems to join our engineering team. You will design, develop and optimise ultra-low-latency Java applications for performance-critical environments, including real-time financial market workloads.

The role requires deep knowledge of JVM internals, advanced concurrency, memory management, and Linux, with a focus on predictable latency.

Qualifications

• Proven experience designing high-performance Java applications.
• Deep knowledge of JVM internals, GC tuning, and memory management.
• Experience with low-latency, real-time or market-driven systems.

Responsibilities

• Design and develop high-performance, low-latency Java applications.
• Optimise JVM performance including GC, JIT, memory allocation and runtime config.
• Develop concurrent, event-driven and reactive systems for real-time processing.
• Analyse performance using profiling, benchmarking and observability tools.
• Collaborate with infrastructure to optimise CPU, memory, networking and OS.

Skills

Java

Low-latency

High-performance

Concurrency

Memory management

Linux

Profiling

Observability

Event-driven

Reactive

Tools

Aeron

JFR

JMC

async-profiler

perf

Job description

Vallum Associates in London is seeking an experienced Java Engineer specializing in high-performance and low-latency systems to join our engineering team. You will design, develop and optimise ultra-low-latency Java applications for performance-critical environments, including real-time financial market workloads.

The role requires deep knowledge of JVM internals, advanced concurrency, memory management, and Linux, with a focus on predictable latency.