Senior Ultra-Low Latency Risk Engine Engineer

Citigroup Inc.; Belfast City District; Hybrid; GBP 110,000 - 150,000; Full time

Benefits offered by this job

27 days annual leave

Discretional bonus

Private Medical Care

Job summary

Citigroup Inc. in the United Kingdom is hiring a Senior Software Engineer to build and maintain an ultra low-latency risk engine for cash equities trading. You will own latency-sensitive components in the risk path, drive architecture decisions, and collaborate with global teams across APAC/EMEA/NAM while mentoring junior engineers.

The role offers a hybrid work model, competitive base salary, and a broad benefits package aimed at supporting professional growth and work-life balance.

Qualifications

• Proven software engineering experience building latency-critical systems for financial trading.
• Strong expertise in low-latency Java and/or C++ with multi-threading and concurrency.
• Experience with high-throughput messaging and IPC frameworks.

Responsibilities

• Design, develop, and maintain ultra low-latency risk engine for real-time checks.
• Architect and optimize multi-threaded components with sub-microsecond performance.
• Coordinate delivery across global teams and mentor engineers.

Skills

Low Latency Java / C++

Multithreading

Java NIO

GC tuning

C++ performance

Linux tuning

Real-time risk management

Education

Bachelor's degree in CS/Engineering

Master's degree preferred

Tools

Aeron

Solace

Job description

Citigroup Inc. in the United Kingdom is hiring a Senior Software Engineer to build and maintain an ultra low-latency risk engine for cash equities trading. You will own latency-sensitive components in the risk path, drive architecture decisions, and collaborate with global teams across APAC/EMEA/NAM while mentoring junior engineers.

The role offers a hybrid work model, competitive base salary, and a broad benefits package aimed at supporting professional growth and work-life balance.