Senior Low Latency Java Engineer

In this role you will lead and implement low-latency Java-based systems within Citi's London High Performance Architectures team. You will build and optimize event-sourcing microservices and contribute to market data handling and trading infrastructure. You will collaborate with senior engineers and cross-functional partners to modernize applications across many teams, delivering high-performance, mission-critical capabilities. This position offers the chance to shape core eTrading platforms and mentor others while operating in a high-skill expertise environment.

• Hands-on development in the Java codebase within a low-latency, in-house framework (10-100 microsecond response)
• Lead integration of functions to meet goals, deploy new products and improve processes
• Analyze complex business and system processes to define scalable solutions
• Provide expert Java low-latency development guidance and design system flows
• Consult with end users to capture specifications and translate into design
• Influence and negotiate with senior leaders and external parties
• Assess risk and ensure compliance, safeguarding Citi and its assets
• Mentor junior developers and less experienced peers

• Subject Matter Expert (SME) in Applications Development
• Experience in Algorithmic Trading development, preferably low latency
• Market Data handling with time-series databases (e.g., KDB)
• Leadership, project management, and development skills
• Proficiency in modern Java, JVM, Linux, system calls and kernel
• Knowledge of TCP/IP networking and kernel bypass (e.g., Solarflare OpenOnload)
• Performance assessment and targeted tuning
• Strong communication, relationship-building, and documentation skills
• Willingness to mentor others

• Excellent communication (high EQ)
• Relationship and consensus-building
• Mentoring and coaching
• Java low-latency development
• Event-sourcing microservices
• KDB and market data handling