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UI Engineer (Contractor)

Citadel Securities
🇺🇸New YorkSeniorContractor$175k–$350kPosted September 22, 2026

About the Role

Citadel Securities is seeking UI Engineers to join a team gathering requirements and continuously delivering high-quality applications. As a crucial member of the team, you will leverage advanced JavaScript knowledge and visualization skills to build scalable and performant web applications, acting as a thought leader who engages the development community to push the boundaries of the next-generation web platform.

  • Develop solutions that enable client-facing investment professionals to research, monitor, and trade in real-time on internal/external information, including gathering requirements, prototyping solutions, and delivering final products that optimize user workflows and interactions across the investment process.
  • Partner with the industry's top analysts, traders, quantitative researchers, and data scientists to design, develop, and deploy solutions that answer fundamental questions about financial markets.
  • Visualize financial data in a way that allows investment professionals to discover new insights, improve research processes, and decision-making.
  • Drive the platform's evolution by challenging the status quo and identifying opportunities to enhance the platform.

Responsibilities

  • Develop solutions that enable our client facing investment professionals to research, monitor, and trade in real-time on internal/external information. This includes gathering requirements, prototyping solutions, and delivering final products that optimize users workflows and interactions across the investment process.
  • Partner with the industry's top analysts, traders, quantitative researchers, and data scientists to design, develop, and deploy solutions that answer fundamental questions about financial markets.
  • Visualize financial data in a way that will allow investment professionals to discover new insights, improve research processes, and decision-making.
  • Drive our evolution by challenging the status quo and identifying opportunities to enhance our platform.

Requirements

  • 5-10 years of work experience, ideally within client/customer facing UX/UI development experience
  • Passion for working with users and developing solutions that deliver amazing user experience (multi-tenants, real-time, high performance web applications)
  • Experience with any of the following: React, Angular, Redux, Electron, WebAssembly, Node.js
  • Experience with wire-framing, prototyping and user-centric design
  • Proficiency with JavaScript (ES6) and TypeScript
  • Proficiency with HTML5 (Canvas, WebWorkers, WebSockets), CSS3, SASS
  • Strong written and verbal communications skills
  • Bachelor's, Master's degree in Computer Science or equivalent experience

What You'll Get

  • $175k–$350k base salary
  • Medical insurance
  • Life insurance
  • Retirement and tax-free savings plans
  • Access to other healthcare programs