UI Engineer- Global Trading Applications

Citadel Securities is building the next generation of trading and control platforms that power global markets. We are seeking a UI Engineer to join our Global Trading Applications team in New York.

This role will support one of two major firmwide initiatives: Control Center or CitSec OMS—platforms that strengthen internal control frameworks, modernize trading workflows, and consolidate complex systems into seamless, high-performance user experiences.

You will work directly with traders, business control, surveillance, regulatory operations, and backend engineering teams to design and deliver scalable, real-time applications used across the firm.

Responsibilities

• Design and build complex, workflow-driven user interfaces using TypeScript and React
• Develop scalable front-end architecture for large-scale trading and control systems
• Integrate UI components with backend services written in C++, Python, and real-time data systems (e.g., KDB+/Q)
• Translate sophisticated trading and compliance workflows into intuitive, high-performance user experiences
• Drive performance optimization, maintainability, and architectural consistency across applications
• Collaborate closely with cross-functional stakeholders to deliver business-critical enhancements

Qualifications

• Strong expertise in TypeScript and React
• Expertise building and maintaining tooling for TypeScript projects (e.g., build systems, testing frameworks, developer workflows)
• Experience building large-scale, production-grade front-end applications
• Deep understanding of UI architecture, state management, and performance optimization
• Experience integrating with distributed or real-time backend systems
• Product-oriented mindset: able to work directly with business users, gather requirements, and deliver practical, scalable solutions
• UX expertise: experience designing intuitive applications that distill complex, real-time data into clear, actionable user experiences, with a strong focus on user productivity
• Ability to operate effectively in environments without dedicated UI design support
• Strong communication skills and ability to work directly with business users
• Experience in financial services, trading systems, or complex workflow platforms is a plus

Why Join Us

• Build systems used directly by trading and control teams in global markets
• Work on high-impact platforms that modernize and consolidate critical workflows
• Collaborate with top-tier engineers and business stakeholders
• Solve technically challenging problems in real-time, high-performance environments

About Citadel Securities

Citadel Securities is a leading global market maker across a broad array of fixed income and equity securities. Our world-class capabilities position us to meet the liquidity demands of our diverse group of institutional clients in all market conditions. In partnering with us, our clients—including asset managers, banks, broker-dealers, hedge funds, government agencies, and public pension programs—are able to gain a powerful trading advantage and are better positioned to meet their investment goals.

The team makes its mark every day from our offices around the world: Chicago, New York, London, Hong Kong, Toronto, Shanghai, Sydney, Dublin.

In accordance with applicable law, the base salary range for this role is $175,000 to $350,000.

In addition, the employee who fills this role will be eligible to participate in a discretionary incentive compensation program, as well as a wide array of benefit programs, such as medical and life insurance, retirement and tax-free savings plans, and access to other healthcare programs.