Senior Java Engineer - Low-Latency, Microservices Maestro

Citigroup; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Citigroup in London is seeking a Senior Low Latency Java Engineer to lead Java-based, low-latency systems within the High Performance Architectures (HPA) team. You will work on algorithmic trading utilities, market data handling, and event-sourcing microservices while mentoring junior engineers and driving performance improvements.

The role focuses on delivering high-speed, reliable systems with a strong emphasis on latency reduction and collaboration across traders and application teams in

Qualifications

• Bachelor's degree or equivalent in a related field.
• Experience in low-latency Java/C++ development.
• Strong knowledge of market data handling and time-series databases (KDB).
• Leadership, project management and mentoring skills.

Responsibilities

• Lead Java low-latency development within the HPA team.
• Architect and implement event-sourcing microservices and frameworks.
• Collaborate with traders and engineers to optimise latency and throughput.
• Mentor junior developers and provide technical guidance.
• Ensure compliance with applicable laws and Citi policies.

Education

Bachelor's degree

Tools

KDB

Solarflare OpenOnload

TCP/IP

Job description

Citigroup in London is seeking a Senior Low Latency Java Engineer to lead Java-based, low-latency systems within the High Performance Architectures (HPA) team. You will work on algorithmic trading utilities, market data handling, and event-sourcing microservices while mentoring junior engineers and driving performance improvements.

The role focuses on delivering high-speed, reliable systems with a strong emphasis on latency reduction and collaboration across traders and application teams in