Join LangChain as a Senior Frontend Platform Engineer to build and evolve the component library for AI applications.
Posted by employer 1 month ago
First seen on Joblaze 1 month ago
Last verified on the company career page 2 hours ago
Skills & Technologies
AI in the day-to-day
Our tools are used by thousands of developers and teams to build, debug, and ship production-grade LLM-powered products.
Not disclosed in this posting: years of experience, work arrangement, visa sponsorship.
Benefits
Joblaze summary
In this role, the Senior Frontend Platform Engineer will focus on developing and maintaining LangChain's component library, ensuring that frontend teams can deliver high-quality, reusable UI components efficiently. Proficiency in React, TypeScript, and design system tooling is essential, along with a strong commitment to accessibility and performance. This position is ideal for experienced engineers who thrive in collaborative environments and have a keen eye for detail. LangChain's growth stage offers a unique opportunity for impactful contributions in a rapidly evolving tech landscape.
Joblaze insights
- Listed about a month ago — first seen on Joblaze August 22, 2026. Last confirmed on LangChain's careers page October 9, 2026.
- Salary band is in line with the typical range for Frontend roles (median ~$180,000).
- Starts above 42% of 53 comparable senior frontend roles that list React we track (median $176,000 across 36 companies). See React salary trends
- React appears in 61.7% of 141 comparable senior frontend roles; CSS-in-JS appears in 0.7% of 141 comparable senior frontend roles.
Quick facts
- What's the salary range?
- LangChain lists $170,000–$195,000 for this role.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: CSS, CSS Modules, CSS-in-JS, Chromatic, HTML, React.
- What seniority level is this role?
- LangChain targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Frontend Platform Engineer, Design Systems role at LangChain.
From the original posting
About Us
About the Role:
This role can be based remotely in the U.S. Ideally SF, NYC, or Boston.
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 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
What You'll Bring:
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
Annual salary range: $180,000 - $240,000
Standard company text repeated across LangChain's postings is omitted here.