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Citi Logo Citi · IT - Software Development

Etrading Infrastructure Systems Architect - Low Latency Engineering

United Kingdom, London · Job Posted March 20, 2026
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Job Description

Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech.

Job Responsibility

  • Ingress/plan/execute/manage technical initiatives to make our electronic trading systems faster, more adaptable stable and maintainable aligned to HPAi standards
  • Communicate ideas, requirements, and results across disparate teams
  • This position will support technical populations (Rates), partnering with leaders to understand their challenges and design and execute solutions to solve them
  • Communicating business and IT requirements to external vendors and internal technical teams

Requirements

  • Low Latency Trading – Rates and Cross Markets, domain specific technology is required
  • Deep knowledge of operating system fundamentals – hyper focus on Linux (REL, CoreOS)
  • Understanding of OSI model and TCP and UDP network protocols
  • Experience with Python and data libraries
  • Fluency with the Unix command line and shell scripting
  • Practical experience with modern Linux systems and systems programming concepts like C, IPC mechanisms, virtual memory, and process life cycle
  • Strong troubleshooting skills and knowledge of profiling/debugging tools such as gdb, perf, DTrace, SystemTap
  • Can understand, interpret, and improve application performance via system tuning
  • Thorough understanding of modern computer architecture - modern x86 AMD and Intel cache hierarchies as an example
  • Kernel-bypass technology knowledge (such as Solarflare OpenOnload / TCPDirect / ef_vi, RoCE, DPDK)
  • Prior experience in a similar Site Reliability Engineering (SRE), DevOps, distributed computing, systems engineering/administration
  • Ability to context switch to work on several projects at once
  • Knowledge of JIRA, SCRUM, Sprints

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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