LangChain
Frontend Engineer, AI Observability & Evals Platform
$160K–$195K
San Francisco, CA +2 · On-site · Full-time · Posted Aug 12, 2026
- Location
- San Francisco, CA
Boston, MA
New York, NY - Experience
- 2+ years of front-end engineering experience.
- Education
- Ideally a degree in computer science or a related field; equivalent experience not stated.
About the job
Develops user-facing features for LangSmith, an enterprise platform for observing, testing, and debugging LLM applications.
What you'll do
- Build features, reusable components, and frontend libraries.
- Translate designs and wireframes into high-quality code and optimize performance across devices and browsers.
- Collaborate with fullstack and backend developers and UX/UI designers to improve usability.
What they ask for
- 2+ years of front-end engineering experience with strong proficiency in React, JavaScript, and TypeScript.
- Hands-on experience with frontend development tools such as Babel, Vite, Webpack, NPM, and Yarn.
- Familiarity with REST APIs and knowledge of modern authorization mechanisms such as JWTs.
- Strong computer science fundamentals.
Nice to have
- A degree in computer science or a related field.
Pay
$160,000-$195,000 USD annual salary range (base salary status not specified)
Tools
React, Typescript, JavaScript, TypeScript, Babel, Vite, Webpack, NPM
AI focus
Builds frontend features for a platform focused on LLM application observability, testing, and debugging.
Model-written summary · the original posting is authoritative