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Citi Logo Citi · IT - Software Development

Senior Java Developer (Smart Order Routing (SOR)) - Equities Electronic Trading

United Kingdom, Belfast · Job Posted June 15, 2026
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Job Description

We are seeking a highly skilled and experienced Smart Order Router (SOR) Developer to join our Equities Electronic Trading team. This is a VP-level position responsible for the design, development, and optimization of our core low-latency execution platform. The overall objective of this role is to drive the technical implementation and innovation of our SOR, a critical component of our electronic trading infrastructure, utilizing modern, high-performance Java and microservices architecture.

Job Responsibility

  • Take a leading role in the design, development, and optimization of high-performance, low-latency microservices and applications, with a primary focus on the Smart Order Router
  • Implement and enhance complex routing logic, venue analysis models, and performance optimizations to ensure best execution and system stability
  • Participate in and lead technical design discussions and conduct rigorous code reviews to ensure the highest standards of quality, performance, and architectural integrity
  • Partner with product development, quantitative researchers, and other technology teams to deliver new trading capabilities and enhance existing systems
  • Drive continuous improvement initiatives in testing frameworks, development tools, and deployment processes for our low-latency and high-throughput environment
  • Resolve complex technical challenges through in-depth analysis of business requirements, system processes, and industry best practices
  • Apply expert knowledge of system architecture, data flow, and development standards for coding, testing, debugging, and implementation
  • Build and maintain robust solutions for trading platform monitoring, trade reconciliation, and application recovery
  • Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency

Requirements

  • Hands-on experience in software development with a strong focus on high-performance, low-latency systems
  • Expert-level technical knowledge in Core Java, including a deep understanding of JVM internals, concurrency, garbage collection, and memory management in a low-latency context
  • Proven experience designing and developing automated trading systems, specifically with Smart Order Routers in Equities or other similar financial domains
  • Solid understanding of financial market protocols (e.g., FIX) and practical experience handling order and market datasets
  • Experience with microservices architecture and developing distributed systems
  • Demonstrable experience with modern testing frameworks, Agile methodologies, and Continuous Integration/Continuous Delivery (CI/CD) processes
  • Excellent communication skills with a demonstrable ability to present and grasp complex technical and business concepts

Nice to have

  • Familiarity with messaging and data grid technologies (e.g., Solace, AMPS, Chronicle) and infrastructure automation tools (e.g., Ansible) is a plus
  • Bachelor’s degree/University degree or equivalent experience operating in a similar role

What we offer

  • 27 days annual leave (plus bank holidays)
  • A discretional annual performance related bonus
  • Private Medical Care & Life Insurance
  • Employee Assistance Program
  • Pension Plan
  • Paid Parental Leave
  • Special discounts for employees, family, and friends
  • Access to an array of learning and development resources
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