Senior Java Low-Latency Developer

Gazelle Global; Greater London; Hybrid; GBP 85,000 - 130,000; Full time

Job summary

Gazelle Global is seeking a Senior Java Low-Latency Developer for a 12-month contract in London, on a hybrid basis (3 days on-site per week). You will join a global engineering function delivering technology where performance, resilience and reliability are critical.

The role focuses on building and enhancing high-performance trading, exchange connectivity and Direct Market Access platforms, collaborating with Product, Engineering, QA and Production Support to turn requirements into robust,

Qualifications

• Strong experience with Core Java and JDK 17+ in low-latency systems.
• Proven ability to build high-performance trading and exchange connectivity platforms.
• Expertise in multithreading, concurrency and JVM tuning.
• Familiarity with CI/CD, Agile practices and automated testing.

Responsibilities

• Develop and enhance high-performance trading platforms with low latency.
• Collaborate with Product, Engineering, QA and Production Support to deliver scalable solutions.
• Drive continuous performance improvement and profiling.
• Work on Direct Market Access platforms and exchange connectivity.

Skills

Core Java, JDK 17+

Low-latency/high-throughput trading

Multithreading, concurrency and JVM

Mechanical sympathy and profiling

Microservices and distributed systems

Event-driven and asynchronous

Automated and performance testing

CI/CD and Agile engineering

FIX Protocol or binary protocols

Job description

A leading financial technology environment is looking for a Senior Java Low-Latency Developer to join a 12-month contract in London, working hybrid three days a week. You'll be part of a global engineering function delivering technology where performance, resilience and reliability are critical.

The role focuses on building and enhancing high-performance trading, exchange connectivity and Direct Market Access platforms. You'll work closely with Product, Engineering, QA and Production Support teams, helping turn requirements into robust, scalable solutions while driving continuous performance improvement.

Key Skills

• Core Java, JDK 17+
• Low-latency/high-throughput trading platforms
• Multithreading, concurrency and JVM tuning
• Mechanical sympathy and performance profiling
• Microservices and distributed systems
• Event-driven and asynchronous processing
• Automated and performance testing
• CI/CD and Agile engineering
• FIX Protocol or binary exchange protocols desirable