Equities Low Latency Java Algo Developer, Citi

Citi

Location:
United Kingdom, London

Category:
IT - Software Development

Contract Type:
Employment contract

Salary:

Not provided

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Job Description:

Join Citi's Equities Smart Order Router team, a core part of Front Office Technology, driving innovation in electronic trading. The role involves developing high-performance, low-latency trading systems, working closely with global teams, and providing Level 3 production support.

Job Responsibility:

Drive the full Software Development Life Cycle for the Equities Smart Order Router, from design to deployment, ensuring robust and high-performance solutions
Work intimately with key stakeholders and colleagues across global regions, including product teams, quantitative analysts, and other engineering groups
Provide essential Level 3 support, resolving complex queries from production support, product managers, and trading desks to maintain platform stability
Directly contribute to the continuous enhancement and stability of a latency-sensitive, high-volume trading platform, directly impacting trade execution and liquidity
Take full ownership of deliverables, ensuring quality, reliability, and successful integration within a dynamic trading environment

Requirements:

Demonstrated prior software development experience within financial markets, preferably with exposure to electronic trading systems or low-latency environments
Expertise in Core Java development (version 1.8 or higher), with a deep understanding of its ecosystem, best practices, and performance characteristics
Excellent command of data structures, concurrent programming (multi-threading), and techniques for highly optimized, low-garbage-collection (zero GC) development, crucial for high-performance applications
Proven experience in developing and optimizing low-latency applications, including advanced performance tuning techniques and profiling to achieve micro seconds level response times
Hands-on experience working with various messaging middlewares (e.g., Kafka, Solace) and TCP-based communication protocols for building resilient and scalable distributed systems
Strong working knowledge of the Linux operating system, including shell scripting and an understanding of system-level performance tuning and troubleshooting in a Linux environment
Practical experience with microservices architecture principles and design patterns, including developing, deploying, and managing services in a distributed environment

Nice to have:

Direct experience in the development or implementation of algorithmic trading strategies, particularly within electronic trading systems and smart order routing
A strong understanding and practical experience with the Financial Information eXchange (FIX) protocol, specifically its application in electronic trading workflows and order management
In-depth knowledge of the order state lifecycle in electronic trading systems, including order creation, execution, cancellation, and various status transitions
Hands-on experience with KDB+ and the Q programming language for handling and analyzing large volumes of time-series financial data
Exposure to containerization technologies (e.g., Docker) and container orchestration platforms (e.g., OpenShift, Kubernetes) for deploying and managing microservices

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 06, 2025

Employment Type:

Fulltime

Work Type:

On-site work

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Equities Low Latency Java Algo Developer