# Senior Frontend Platform Engineer, Design Systems

**Company:** [LangChain](https://hotfix.jobs/companies/langchain)
**Location:** San Francisco, CA, Boston, MA, New York, NY
**Role:** Frontend Engineering
**Salary:** $170k – $195k/yr
**Experience:** 5+ years
**Skills:** React, TypeScript, HTML, CSS, Css Modules, Css-In-Js, Tailwind, Sass, Storybook, Chromatic, Design Tokens, Visual Regression Testing
**Posted:** 2026-08-22

> Build and evolve LangChain’s reusable React component library and the tooling that supports accessible, consistent, high-quality interfaces across its products. The role requires strong React and TypeScript expertise, design-systems experience, and close collaboration with designers.

## Job Description

## Responsibilities
- Build and own LangChain’s component library.
- Design and implement reusable, composable React components that are flexible, accessible, and production-ready.
- Partner with designers to translate design systems, tokens, and interaction patterns into code.
- Develop design-system tooling and workflows for theming, tokens, versioning, testing, and component discovery, including Storybook.
- Make architectural decisions supporting accessibility, performance, consistency, and maintainability.
- Improve UI build and test workflows.
- Optimize build performance, bundling strategy, and package versioning for the component library.
- Maintain tooling for UI testing and dependency management.

## Requirements
- Strong experience building modular, composable, and well-documented component libraries or design systems.
- Deep knowledge of React, TypeScript, HTML, and CSS.
- Familiarity with styling approaches such as CSS Modules, CSS-in-JS, Tailwind, and Sass.
- Experience collaborating closely with designers and non-engineering partners.
- Strong attention to detail and a high bar for craft.
- Passion for accessibility and inclusive design.
- Familiarity with UI component testing and visual regression testing.

## Nice to Have
- Experience with Storybook, Chromatic, and design-token pipelines.

## Compensation & Benefits
- Annual salary range: **$170,000–$195,000 USD**.
- Variable compensation for relevant roles, meaningful equity, and benefits.
- Medical, dental, and vision coverage.
- Flexible vacation.
- 401(k) plan and life insurance.
- Meals on in-office days in the US.

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**Apply:** https://hotfix.jobs/jobs/4840f594-41e4-4077-abbe-8b73cbb26708
**Canonical:** https://hotfix.jobs/jobs/4840f594-41e4-4077-abbe-8b73cbb26708