Java Developer – Front Office / Trading Systems

Java Developer – Front Office / Trading Systems Join MARGO in the UK (London) – Perm & Contracting Opportunity* MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry. We specialise in complex software engineering environments where performance, robustness and scalability are critical: low latency systems, real-time data processing, distributed architectures and high-volume flows. Joining MARGO means working in demanding Front Office and Risk IT environments, while benefiting from a human-sized structure, close follow-up and tailor-made training paths. Business Context You will join the Front Office / Trading IT environment of one of our tier-1 investment banking partners. The teams design and maintain mission-critical Java systems supporting electronic trading activities across multiple asset classes (e.g. Equities, Fixed Income, Commodities, FX, Derivatives). The environment is characterised by: · Real-time and event-driven architectures · High performance and low-latency constraints · Close interaction with trading, quantitative and risk teams · Short delivery cycles and high engineering standards Role Overview We are looking for an experienced Java Developer to work on real-time trading and risk systems. The role is primarily technical , focused on software engineering excellence rather than business analysis. Candidates are expected to have prior exposure to Front Office, Trading or Risk environments , regardless of the underlying asset class. Key Responsibilities Design & Development · Design, develop and maintain high-performance Java applications · Work on real-time data processing (market data, pricing, orders, analytics) · Implement multithreading and concurrency patterns adapted to performance-critical systems · Participate in system design, architecture discussions and technical specifications · Continuously optimise performance (latency, throughput, memory, GC behaviour) Engineering & Delivery · Contribute to the full software lifecycle: design, development, testing and release · Produce clean, maintainable and well-tested code · Participate in sprint planning, estimations and technical reviews · Collaborate closely with developers, quant and infrastructure teams Production & Support · Provide 3rd line support on production systems when required · Participate in production releases (including occasional out-of-hours interventions) · Contribute to system stability, monitoring and incident prevention Technical Environment Core Technologies · Java (expert level) - Multithreading & concurrency - Performance optimisation & low latency techniques - Garbage Collection awareness · Linux / UNIX environments · Distributed systems and messaging architectures · Performance monitoring and profiling tools Valued Technical Exposure · Event-driven or real-time systems · Messaging middleware (Kafka, Solace or equivalent) · FIX or other market connectivity protocols · Networking fundamentals (TCP/IP, multicast) Required Experience & Skills Essential · Strong experience as a Java Developer in performance-critical environments · Proven background in low-latency or high-throughput systems · Solid understanding of concurrency, threading and memory management · Experience working in Front Office, Trading or Risk IT environments · Comfortable working in Linux production environments · Clear communication and structured problem-solving skills Valued (but not restrictive) · Exposure to one or more asset classes (Equities, Fixed Income, Commodities, FX, Derivatives) · Experience in trading, pricing, risk or market data systems Why Join MARGO · Access to multi-asset Front Office environments · Highly technical and challenging engineering assignments · Strong emphasis on skill development and long-term career progression · Human-sized consultancy with close support and high-quality missions Please note - We do not offer visa sponsorship for this position. Interested? Motivated? Apply on our website or at [email protected]