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Senior Low Latency Java 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

Job Description:

This is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology Team. The role involves senior, low-latency systems and application framework engineering skilled in Java, C++, Rust, KDB, market data, and algorithmic trading technology within London's High Performance Architectures (HPA) team.

Job Responsibility:

  • 90% hands in the Java codebase
  • build microservices based event sourcing systems on a low latency in-house framework with 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
  • 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 Rust, 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:
August 22, 2025

Employment Type:
Fulltime
Work Type:
On-site work
Job Link Share:
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