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Location: London, UK (Hybrid – 3 days onsite) Contract: Initial 12-month contract Rate: Up to £800/day (Inside IR35)We are seeking a Senior Quantitative Developer to join a high-performing electronic FX (eFX) technology team within a leading global investment bank. This role focuses on the design, development, and optimisation of low-latency trading systems that support automated pricing, execution, and quantitative trading strategies.Key Responsibilities Design and build low-latency, event-driven trading systems for FX marketsCollaborate with quantitative analysts to integrate and optimise trading modelsDevelop and enhance capabilities across pricing, execution, and back-testing frameworksConduct latency and performance analysis, driving continuous optimisationBuild analytics and monitoring tools to assess system and model performanceContribute to the scalability, resilience, and reliability of the core trading platformWork in an agile delivery environment with frequent releases to production Required Skills & Experience Strong experience in electronic trading systems, ideally within FXProven track record building low-latency, high-throughput applicationsAdvanced Java development skills, including performance optimisation (low GC, lock-free techniques)Experience with Real Time messaging frameworks/protocols (eg Aeron, Kafka, FIX, ITCH, OUCH)Familiarity with time-series data platforms, preferably KDBSolid understanding of modern software engineering practices (CI/CD, testing, agile)Ability to work closely with cross-functional teams and contribute to technical documentation