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Senior Frontend Platform Engineer, Design Systems

LangChain· Engineering
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Remote$180k - $240kFull-timePosted 8mo ago

About the role

Design Systems Engineer focused on building, owning, and evolving LangChain’s component library to provide a cohesive, scalable, and high-quality UI foundation across LangChain’s frontend products. Works at the intersection of Design and Engineering with designers, product engineers, and platform teams to turn design intent into robust, reusable components and tooling, with ownership and influence across LangChain’s products.

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
  • Build reliable UI quality systems
  • Develop design system tooling and improve workflows around theming, tokens, versioning, testing, and component discovery (e.g. Storybook)
  • Make thoughtful architectural decisions that enable accessibility, performance, consistency, and maintainability across LangChain’s UI stack
  • Improve UI build and test workflows
  • Optimize build performance, bundling strategy, and package versioning for the component library
  • Maintain tooling for testing, dependency management of the UI app

Qualifications

  • Extensive 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, etc.) and design system toolings (Storybook, Chromatic, tokens pipelines, etc.)
  • Experience collaborating closely with designers and non-engineering partners
  • Strong attention to detail and a high bar for craft and genuine passion for accessibility and inclusive design
  • Familiarity with testing UI components and visual regression testing

Skills

Required:Component librariesReactTypeScriptHTML/CSSDesign system toolingTesting UI components

Benefits

  • medical, dental, and vision coverage
  • flexible vacation
  • a 401(k) plan
  • meals on in-office days in the US
  • and more
Last updated Oct 14, 2026. Interested? Apply on the company site.

About LangChain

Engineer reliable agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

AI agentsagent engineeringbrex-fastest-growing-2025liquid-ai-recruiting-targetopen source frameworksplatform
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