Senior Frontend Platform Engineer

Responsibilities

• Build and own LangChain’s component library.
• Design and implement reusable, composable, accessible, production-ready React components.
• Translate design systems, tokens, and interaction patterns into code in partnership with designers.
• Develop tooling and workflows for theming, tokens, versioning, testing, and component discovery.
• Make architectural decisions supporting accessibility, performance, consistency, and maintainability.
• Improve UI build and test workflows, including bundling performance and package versioning.
• Maintain testing and dependency-management tooling for the UI application.

Requirements

• Strong experience building modular, composable, and well-documented component libraries or design systems.
• Deep knowledge of React, TypeScript, HTML, and CSS.
• Familiarity with CSS Modules, CSS-in-JS, Tailwind, Sass, Storybook, Chromatic, and token pipelines.
• Experience collaborating closely with designers and non-engineering partners.
• Strong attention to detail and commitment to accessibility and inclusive design.
• Familiarity with UI component testing and visual regression testing.

Benefits

• Medical, dental, and vision coverage.
• Flexible vacation.
• 401(k) plan and life insurance.
• Meals on in-office days in the US.
• Meaningful equity, variable compensation where relevant, and other perks.
• EU, UK, and APAC team members receive locally competitive benefits aligned with regional norms and regulations.