Java Low Latency Engineer

DCV Technologies; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Job summary

DCV Technologies in London, UK (Hybrid-2/3 days from office) is seeking a Java Low Latency Engineer for a long-term contract. You will optimize Java performance, tune the JVM, and build high-frequency, event-driven systems designed for low latency.

Ideal candidates have strong multithreading, data structures knowledge, and familiarity with Linux internals. Nice-to-haves include Aeron and experience in trading or other performance-critical domains.

Qualifications

• Proven expertise in Java performance optimization and JVM tuning.
• Strong understanding of low-latency, event-driven design.
• Experience with multithreading, memory management and Linux perf.

Skills

Core Java proficiency

JVM tuning

Multithreading

Data Structures & Algorithms

GC & memory management

Networking (TCP/UDP)

Linux performance

Low-latency systems

C/C++ interop (JNI/Unsafe)

Aeron (nice to have)

Job description

Position: Java Low Latency Engineer

Location: London, UK (Hybrid-2/3 days from office)

Long term contract position

Role Overview

We are looking for an experienced Java Low Latency Engineer with strong expertise in Java performance optimization, JVM tuning, and high-performance system development. The ideal candidate will have experience building event-driven, concurrent systems designed for low-latency and high-frequency environments

Required Skills & Experience

• Strong Core Java and JVM performance tuning expertise.
• Excellent knowledge of Data Structures and Algorithms.
• Experience with concurrency, multithreading, and low-latency system design.
• Knowledge of GC, JNI, Java Unsafe, and JNR-FFI.
• Strong understanding of CPU architecture, shared memory, and memory-mapped files.
• Experience with networking protocols such as TCP and UDP.
• Good understanding of Linux internals and system-level performance optimization.

Nice to Have

• Experience with Aeron messaging and transport technology.
• Background in high-frequency trading (HFT), electronic trading, or other performance-critical systems