Low Latency Rust Software Engineer

Overview

As a senior engineer in Citis London High Performance Architectures team, you will design and implement low-latency systems powering algorithmic trading. You’ll work hands-on in Rust and Java, contributing to in-house microservices and event-sourced frameworks that achieve microsecond-scale response times. You’ll mentor developers, collaborate with cross-functional teams, and help modernize applications across Citi’s trading platforms. This role offers exposure to global markets, scale, and meaningful impact on financial systems.

Pay / Benefits

• Hybrid working model (up to 2 days at home)
• Competitive base salary with annual review
• 27 days annual leave plus bank holidays
• Discretionary annual bonus
• Private medical care & life insurance
• Employee Assistance Program (EAP)

• Hands-on development in Rust or Java within a low-latency microservices framework
• Lead integration of functions to meet goals and deploy new products
• Analyze complex business and system processes to design high-level solutions
• Provide expert Java low-latency development guidance and optimization
• Consult with end users to capture system specifications and influence design
• Engage with senior leaders and external partners for alignment
• Mentor junior developers and less experienced engineers
• Support/educate teams on market data, replay and backtest utilities
• Contribute to performance tuning and architectural elegance
• Document key system flows and model aspects using diagrams (UML)

• Subject Matter Expert in Applications Development
• Experience with Algorithmic Trading development in low-latency environments
• Knowledge of Market Data handling and time-series databases (e.g., KDB)
• Leadership, project management, and development skills
• Strong Java proficiency, JVM, Linux, system calls, kernel knowledge
• TCP/IP networking, hardware-accelerated kernel bypass (e.g., Solarflare OpenOnload)
• Performance assessment and targeted tuning
• Strong design/architecture skills and UML documentation
• Excellent communication and consensus-building abilities
• Nice to have: background in C++

• Great communicator with high EQ
• leadership and mentoring
• customer-focused collaboration
• Rust
• Java
• KDB