Senior Frontend Platform Engineer, Design Systems

Today, LangChain, LangGraph, LangSmith, and Agent Builder are used by teams shipping real AI products across startups and large enterprises. Millions of developers trust LangChain to power AI teams at companies like Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500.

LangChain is building the infrastructure that powers the next generation of AI applications. Our tools are used by thousands of developers and teams to build, debug, and ship production-grade LLM-powered products.

As our product surface area grows, so does the need for a cohesive, scalable, and high-quality UI foundation. That’s where Design Systems comes in. We’re looking for a Design Systems Engineer to help build, own, and evolve LangChain’s component library —the foundation that our frontend teams rely on to ship fast without sacrificing quality, accessibility, or consistency.

This role sits at the intersection of Design and Engineering. You’ll work closely with designers, product engineers, and platform teams to turn design intent into robust, reusable components and tooling that scale across the product.

You’ll have ownership, influence, and your work will be directly consumed across LangChain’s products.

What You’ll Do:

Build and own 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

Strong experience building modular, composable, and well-documented component libraries and/or design systems

Deep knowledge of React, TypeScript, HTML, and CSS, f amiliarity 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

Compensation:

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Benefits include things like medical, dental, and vision coverage, flexible vacation, a 401(k) plan, and life insurance. Actual compensation and offerings will vary based on role, level, and location. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.

Annual salary range: $170,000 - $195,000

Compensation Philosophy:

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Actual compensation and offerings will vary based on role, level, and location. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.