Senior Java Software Engineer

Senior Software Developer – Low-Latency Exchange TradingLocation: London (Hybrid)About the Role: We are working on behalf of a leading player in the digital asset and trading infrastructure space, currently hiring a Senior Java Software Developer to join their high-performance trading systems team. This position focuses on exchange connectivity and ultra-low latency trading infrastructure, supporting both spot and derivative markets across global platforms.The role offers a unique opportunity to help re-architect a core trading stack in a high-frequency trading (HFT) environment. You’ll work closely with engineering, trading, and quant teams to deliver robust, scalable systems capable of meeting the demands of 24/7 global markets.Responsibilities:Design, build, and optimise ultra-low latency connectivity with multiple global trading venues.Architect resilient, high-throughput components for real-time market data processing and order execution.Leverage cutting-edge messaging systems (e.g., Aeron, SBE) to maximise performance.Identify and resolve microsecond-level bottlenecks through JVM and system profiling.Improve infrastructure reliability with advanced monitoring and automation.Contribute to the evolution of a cloud- and colo-based hybrid infrastructure stack.Ensure compliance with rigorous uptime, latency, and security standards.Drive automation to streamline trading workflows and reduce operational risk.Key Skills & Experience:10+ years of commercial Java development experience in performance-critical environments.Strong understanding of exchange-facing protocols (e.g., FIX, binary, custom APIs).Advanced skills in JVM tuning, garbage collection optimisation, and memory management.Expertise in high-performance messaging and serialization frameworks.Deep networking knowledge: TCP/UDP, kernel bypass (e.g., DPDK, Solarflare), and IPC.Proven experience with concurrent programming and multi-threaded architectures.Familiarity with systems-level performance tuning on Linux, including NUMA and huge pages.Hands-on experience in HFT or low-latency trading environments.Ability to thrive under pressure in a fast-moving, high-stakes setting.Nice to Have:Experience with infrastructure-as-code and cloud-native tools (e.g., Kubernetes, AWS, Terraform).Background in low-level programming (e.g., C/C++, Rust) or functional languages (e.g., Q/KDB+, Haskell).Understanding of hardware acceleration techniques including FPGA and RDMA.Why Apply:Join an ambitious, technically elite team in a growing industry.Contribute to the development of innovative trading technologies at the forefront of digital markets.Competitive compensation, including performance-related bonuses.Comprehensive benefits package including private healthcare and pension contributions.A fun and inclusive office culture with regular team events, socials, and in-house perks.