Senior Core Java Engineer - Low-Latency Trading Salary: Up to £125,000 + bonus + benefits Location: City of London (3 days onsite) Build ultra-low latency systems at the heart of global FX trading! This is an opportunity for a Senior Core Java Engineer to join a leading Asian FX trading firm as they continue to scale their London engineering team. You''ll play a key role in designing and optimising high-performance trading systems where speed, precision and reliability are critical. If you enjoy working close to the metal, solving complex performance challenges and operating in a fast-paced financial environment, this is the role for you. What you''ll be doing Design, build and optimise low-latency, high-throughput Core Java trading systemsOwn and drive performance improvements across critical componentsContribute to the architecture and evolution of a world-class FX trading platform processing billions of messages per dayMentor engineers and promote best practices around testing, code quality and performanceOperate within modern engineering practices including CI/CD, TDD, and Agile Tech Environment Core Java (no frameworks), multithreading, concurrency, low-latency optimisation, AWS/GCP, Docker, Kubernetes, CI/CD, TDD, Agile. ? What they''re looking for Strong commercial experience in Core Java development (framework-light / no Spring environments preferred)Deep understanding of multithreading and concurrencyExperience building or optimising low-latency or high-p