UI Engineer- Global Trading Applications

UI Engineer

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.

About Citadel Securities

Citadel Securities is a technology-driven, next-generation global market maker. We provide institutional and retail investors with world-class liquidity, competitive pricing and seamless front-to-back execution in a broad array of financial products. Our teams of engineers, traders and researchers harness leading-edge quantitative research and the accelerating power of compute, machine learning and AI to power our analytics and tackle the market's and our clients' most critical challenges. Together, we are forging the future of capital markets. For more information, visit citadelsecurities.com.