Frontend Engineer, AI Observability & Evaluations Platform

LangChain; Cambridge (MA); Hybrid; USD 160,000 - 195,000; Full time

Benefits offered by this job

Medical, dental, and vision

Flexible vacation

401(k)

Meals on in-office days

Job summary

LangChain is seeking a frontend engineer to build and enhance LangSmith features for observability, testing, and debugging of AI agents. The role supports an enterprise platform with a focus on robust UI in a fast-paced startup environment.

You will work in one of our offices (SF, NY, or Boston) or hybrid arrangements depending on location and role requirements. Strong React/TypeScript skills and a user-centric mindset are essential.

Qualifications

• 2+ years of Front-end engineering experience with React, JavaScript and TypeScript.
• Experience with modern front-end tooling and libraries.
• Familiarity with REST APIs and working with fullstack/backend engineers.
• Knowledge of JWT-based authorization and secure access patterns.
• Strong UX intuition and ability to translate designs into clean interfaces.

Responsibilities

• Develop new user-facing features using React and TypeScript.
• Build reusable components and front-end libraries.
• Translate designs into high-quality code and optimize performance.
• Collaborate with backend and UX/UI designers to improve usability.

Skills

React

TypeScript

JavaScript

REST APIs

JWT

UI/UX mindset

Communication

CS fundamentals

Education

BS in Computer Science

Tools

Babel

Vite

Webpack

NPM

Yarn

Job description

LangChain is seeking a frontend engineer to build and enhance LangSmith features for observability, testing, and debugging of AI agents. The role supports an enterprise platform with a focus on robust UI in a fast-paced startup environment.

You will work in one of our offices (SF, NY, or Boston) or hybrid arrangements depending on location and role requirements. Strong React/TypeScript skills and a user-centric mindset are essential.