Senior Frontend Platform Engineer, Design Systems

The role

You will build, own, and evolve LangChain's component library. You will work at the intersection of Design and Engineering to create reusable React components and tooling.

What you will do

• Build out LangChain's component library
• Design and implement reusable, composable React components
• Partner with designers to translate design systems, tokens, and interaction patterns into code
• Build reliable UI quality systems
• Develop design system tooling and improve workflows around theming, tokens, versioning, testing, and component discovery
• Make architectural decisions for accessibility, performance, consistency, and maintainability
• Improve UI build and test workflows
• Optimize build performance, bundling strategy, and package versioning
• Maintain tooling for testing and dependency management

Required qualifications

• Extensive experience building modular, composable, and well-documented component libraries and/or design systems
• Deep knowledge of React, TypeScript, HTML, and CSS
• Experience collaborating closely with designers and non-engineering partners
• Strong attention to detail
• High bar for craft
• Genuine passion for accessibility and inclusive design
• Familiarity with testing UI components and visual regression testing

Nice to have

• Familiarity with styling approaches (CSS Modules, CSS-in-JS, Tailwind, Sass, etc.)
• Familiarity with design system toolings (Storybook, Chromatic, tokens pipelines, etc.)

Benefits

• medical, dental, and vision coverage
• flexible vacation
• 401(k) plan
• meals on in-office days in the US

About the company

LangChain builds the foundation for agent engineering, helping developers move from prototypes to production-ready AI agents. The platform includes LangSmith and open-source frameworks like LangChain and LangGraph.