Frontend Platform Engineer

About the company

• LangChain's mission is to make intelligent agents ubiquitous
• Platform includes LangSmith, open source frameworks (LangChain, LangGraph, Deep Agents)
• $125M raised at Series B from IVP, Sequoia, Benchmark, CapitalG, Sapphire Ventures
• 100M+ monthly open source downloads, 6,000+ active LangSmith customers

Responsibilities

• Build out LangChain's component library
• Design and implement reusable, composable React components that are flexible, accessible, and production-ready
• Partner closely with designers to translate design systems, tokens, and interaction patterns into code
• Develop design system tooling and improve workflows around theming, tokens, versioning, testing, and component discovery (e.g. Storybook)
• Make architectural decisions enabling accessibility, performance, consistency, and maintainability
• Optimize build performance, bundling strategy, and package versioning
• Maintain tooling for testing, dependency management of the UI app

Requirements

• Extensive experience building modular, composable, well-documented component libraries and/or design systems
• Deep knowledge of React, TypeScript, HTML, and CSS
• Familiarity with styling approaches (CSS Modules, CSS-in-JS, Tailwind, Sass) and design system tooling (Storybook, Chromatic, tokens pipelines)
• Experience collaborating closely with designers and non-engineering partners
• Strong attention to detail and high bar for craft
• Genuine passion for accessibility and inclusive design
• Familiarity with testing UI components and visual regression testing

Conditions

• Remote in the U.S., ideally SF, NYC, or Boston
• Annual salary range: $180,000 - $240,000
• Base salary, variable compensation, meaningful equity, benefits
• Medical, dental, and vision coverage, flexible vacation, 401(k) plan