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Senior Low Latency Engineer

https://www.citi.com/ Logo

Citi

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Employment contract

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Salary:

Not provided
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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:

  • 90% hands in the Java or Rust codebase. We build microservices based event sourcing systems on a low latency in-house framework. Response times in the 10 microsecond to 100 microsecond range
  • Lead integration of functions to meet goals, deploy new products, and enhance processes
  • Analyse complex business processes, system processes, and industry standards to define and develop solutions to high level problems
  • Provide world class expertise in area of Java low latency development
  • Utilize advanced knowledge of supported main system flows and comprehensive knowledge of multiple areas to achieve technology goals
  • Consult with end users to identify system function specifications and incorporate into overall system design
  • Influence and negotiate with senior leaders and communicate with external parties
  • Happy to work with and educate and support/mentor Junior developers and less experienced senior Java developers

Requirements:

  • Demonstrated Subject Matter Expert (SME) in area(s) of Applications Development
  • In-depth experience with Algorithmic Trading application development, preferably in low latency environment
  • Detailed comprehension and experience with Market Data handling and associated technologies (such as time-series databases e.g. KDB)
  • Demonstrated leadership, project management, and development skills
  • Passion for coding excellent, commercial grade, mission critical Java frameworks based on event sourcing microservices
  • Complete knowledge of modern Java, the JVM, the Linux Operating system, system calls and Kernel
  • Knowledge of TCP and other IP based network protocol technologies including hardware accelerated kernel bypass e.g. Solarflare OpenOnload
  • Performance assessment and targeted tuning
  • Design and architectural elegance
  • Experience in implementing projects
  • Great communicator with high EQ
  • Ability to occasionally produce clear diagrammatic documentation and model key aspects in UML sequence diagrams
  • Relationship and consensus building skills

Nice to have:

Background in C++

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

Additional Information:

Job Posted:
May 17, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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