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# Frontend Engineer, AI Observability & Evals Platform

- **Company:** Langchain, Inc
- **Location:** Boston, MA, United States
- **Experience:** Experienced
- **Salary:** $160,000.0 - $195,000.0
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Software Debugging, Design of User Interfaces, TypeScript, Website Wireframe, Apache Yarn, Large Language Models, Backend, Webpack, Information Technology, Npm(Software), Front End Software Development, Restful APIs
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/frontend-engineer-ai-observability-evals-platform-langchain-7807012

## About the Role

* 2+ years of Front-end engineering experience with strong proficiency in React, JavaScript and TypeScript
 * Hands-on experience with front-end development tools like Babel, Vite, Webpack, NPM, and Yarn
 * Familiarity with REST APIs and experience working closely with fullstack and backend engineers
 * Knowledge of modern authorization mechanisms, such as JWTs
 * A passion for user experience, design and building clean, engaging, and intuitive interfaces
 * Strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders
 * The DNA to thrive in a start-up, fast-paced environment. Views unstructured environments as an opportunity to figure out the most impactful work and help define the future success of the company
 * An ownership mind-set. You are self-driven and look for opportunities to make an impact.
 * Strong computer science fundamentals, ideally with a degree in computer science or related field

## Description

We're looking to add a frontend engineer to develop and enhance new features on LangSmith, working on our enterprise platform product for LLM application observability, testing, and debugging.

*This role can be based in our San Francisco, New York, or Boston office. Employees within commuting distance work from the office five days per week. Candidates who live outside commuting distance (e.g. >1hr each way), may be eligible for hybrid arrangements depending on location and role requirements.

What You Will Do:

 * Develop new user-facing features using React & Typescript
 * Build reusable components and front-end libraries for future use
 * Translate designs and wireframes into high-quality code
 * Optimize components for maximum performance across a vast array of web-capable devices and browsers
 * Collaborate with fullstack and backend developers and UX/UI designers, to enhance usability


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