Senior UI Engineer - Design Systems

Senior UI Engineer - Design Systems

Job Description

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors.

We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate.

We are seeking an accomplished Senior UI Engineer to join our product engineering team. This role focuses on building scalable, maintainable, and reusable React components, leveraging Tailwind CSS, JavaScript, Storybook.js, and a structured design token system (both primitive and semantic) to deliver consistent, enterprise‑grade user interfaces. You will collaborate closely with product designers, other software engineers, product managers, and QA engineers across 30 development teams to create UI components and patterns that power complex workflows across our web‑based enterprise application for thousands of CoStar Group employees.

Your contributions will result in improved developer experiences, more rapid feature development, and more consistent designs for users.

This position is located in our Richmond, VA office and offers a schedule of Monday‑Thursday in‑office and Friday remote.

• Opportunity to influence and evolve our Tailwind‑based design system
  , token architecture, and UI component library.
• A collaborative engineering culture invested in modern frontend technologies
  .
• Continued professional growth within a forward‑thinking product team.

• Build and maintain robust React components using Tailwind CSS and design tokens to ensure consistency, clarity, and scalability across the UI.
• Develop, document, and showcase components in Storybook.js
  , supporting component‑driven development and enhancing cross‑team collaboration.
• Implement and extend design tokens (primitive and semantic) to align styling, spacing, typography, color, and interaction patterns across the design system.
• Collaborate with product designers to translate design specifications into pixel‑accurate, accessible, and performant UI implementations.
• Ensure responsive, accessible, and cross‑browser interfaces
  , leveraging Tailwind CSS’s utility‑first approach for rapid iteration.
• Optimize UI performance through efficient rendering strategies, state management, and bundle‑size improvements.
• Contribute to and evolve the UI design system
  , including Tailwind configuration, token architecture, Storybook stories, and documentation.
• Integrate frontend components with RESTful or Graph
  
  QL APIs using modern React patterns.
• Write clean, well‑documented code
  , participating in code reviews to maintain high engineering standards.
• Troubleshoot and resolve frontend issues across environments while contributing to best practices and process improvements.

• Bachelor’s degree in Computer Science, Engineering, or equivalent from an accredited, not‑for‑profit, in‑person university or college.
• 3+ years of professional frontend or UI engineering experience, ideally in enterprise‑scale applications.
• Strong expertise in React, including hooks, state management, and component composition.
• Advanced experience with Tailwind CSS, including custom theming, responsive design, and utility composition.
• Hands‑on experience with Storybook.js, including creating stories, documentation, and component demos.
• Solid understanding of design tokens, both primitive (e.g., spacing,…