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Senior Frontend Engineer for AI Observability & Evals Platform

LangChainSan Francisco, CA
On-site Full-time $175K/yr - $225K/yr

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Experience Level

Senior

Qualifications

Extensive frontend engineering experience with strong proficiency in React, JavaScript, and TypeScript. Hands-on experience with frontend development tools like Babel, Vite, Webpack, NPM, and Yarn. Familiarity with REST APIs and experience collaborating closely with fullstack and backend developers.

About the job

About Us:

At LangChain, we are dedicated to making intelligent agents a common part of everyday technology. Our goal is to provide a robust foundation for agent engineering that empowers developers to transition from prototypes to production-ready AI agents that teams can depend on. Initially starting as a widely embraced open-source toolset, we have expanded our offerings to include a comprehensive platform for the building, evaluating, deploying, and managing of agents at scale.

Currently, our tools, LangChain, LangGraph, LangSmith, and Agent Builder, are utilized by teams developing real AI products in both startups and large enterprises. Millions of developers rely on LangChain to power AI initiatives at notable companies such as Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500.

Having secured $125M in Series B funding from leading investors like IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we are in an exciting phase of product development and rapid growth, where every team member has a substantial impact on our projects and collaborative efforts. At LangChain, your contributions will play a crucial role in shaping how this technology manifests in the real world.

About the Role:

This position requires in-person attendance 5 days a week in San Francisco, CA, as well as options in New York and Boston.

We are seeking a seasoned frontend engineer to innovate and improve features on LangSmith, our enterprise platform designed for LLM application observability, testing, and debugging.

What You Will Do:

  • Create new user-facing features utilizing React and TypeScript.

  • Develop reusable components and front-end libraries for future projects.

  • Convert designs and wireframes into high-quality, maintainable code.

  • Optimize components for peak performance across diverse web-capable devices and browsers.

  • Collaborate with fullstack and backend developers as well as UX/UI designers to enhance usability and experience.

You’re a Good Fit If You Have:

  • Extensive frontend engineering experience, with strong command of React, JavaScript, and TypeScript.

  • Practical experience with frontend development tools such as Babel, Vite, Webpack, NPM, and Yarn.

  • Familiarity with REST APIs and experience collaborating closely with fullstack and backend developers.

About LangChain

LangChain is at the forefront of intelligent agent technology, guiding developers from initial prototypes to reliable, production-ready AI agents. With a strong foundation in open-source tools, we have evolved into a platform that enables large-scale agent building and operation, trusted by millions of developers globally.

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