Location: London Contract: 12 months Working Pattern: Hybrid – 3 days per week onsite Positions: 3 We are recruiting experienced Senior Java Low-Latency Developers to design and develop high-performance trading, exchange connectivity and Direct Market Access platforms. This is a hands-on senior engineering role focused on building resilient, scalable and latency-sensitive systems using Core Java / JDK 17+, microservices, distributed systems and event-driven architecture. Essential experience: Strong hands-on Core Java development, preferably JDK 17+. Proven experience building low-latency, high-throughput trading, order management or market connectivity platforms. Deep knowledge of multithreading, concurrency, memory management, garbage collection, JVM tuning and mechanical sympathy. Strong experience with performance profiling, throughput optimisation and scalable distributed architectures. Hands-on experience with microservices, asynchronous processing, messaging and event-driven integration. Experience with automated testing, performance testing, Agile and CI/CD. Approximately 10+ years' technology experience, including significant experience within Financial Services. Desirable experience: FIX Protocol and binary exchange protocols Direct Market Access (DMA), electronic trading and exchange connectivity High-performance messaging, caching and non-blocking processing Latency measurement and performance optimisation Cloud-native technologies and container platforms Observability and modern DevOps tooling GitHub Copilot or similar AI-assisted engineering tools Technical architecture, engineering standards and governance Candidates must be able to work 3 days per week onsite in London. Keywords: Core Java, JDK 17, Low Latency, High Throughput, Electronic Trading, FIX Protocol, DMA, Exchange Connectivity, Market Connectivity, Multithreading, Concurrency, JVM Tuning, Mechanical Sympathy, Microservices, Event-Driven Architecture, Distributed Systems, CI/CD