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Salary: USD 170,000 - 195,000 / annual
LangChain is seeking a Senior Frontend Platform Engineer to build and own the company's design system and component library. The role sits at the intersection of design and engineering, requiring close collaboration with designers, product engineers, and platform teams to translate design intent into robust, reusable React components and tooling that scale across LangChain's product suite.
Key responsibilities include designing and implementing reusable, composable React components that are flexible, accessible, and production-ready; partnering with designers to translate design systems, tokens, and interaction patterns into code; developing design system tooling and improving workflows around theming, tokens, versioning, testing, and component discovery (e.g., Storybook); making thoughtful architectural decisions that enable accessibility, performance, consistency, and maintainability across the UI stack; optimizing build performance, bundling strategy, and package versioning for the component library; and maintaining tooling for testing and dependency management.
Required qualifications include strong experience building modular, composable, and 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 with a high bar for craft and genuine passion for accessibility and inclusive design; and familiarity with testing UI components and visual regression testing.
LangChain is a Series B company ($125M raised from IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures) building infrastructure for AI applications. The platform includes LangSmith (observability, evaluation, deployment, fleet, and sandboxes), open-source frameworks (LangChain, LangGraph, Deep Agents), and LangSmith Engine. The company has 100M+ monthly open-source downloads, 6,000+ active LangSmith customers, and 35% of the Fortune 500 uses LangSmith in production.
About LangChain
AI / Data / Infrastructure — developer platform and framework for building LLM applications and agents.
