LangChain
Senior Frontend Engineer, AI Observability & Evals Platform
$180K–$240K
Remote - US · Remote · Senior · Full-time · Posted Aug 13, 2026
- Experience
- Extensive front-end engineering experience; no number of years stated.
- Education
- Strong computer science fundamentals, ideally with a degree in computer science or a related field.
About the job
Develop and enhance user-facing features for LangSmith, an enterprise platform for LLM application observability, testing, and debugging.
What you'll do
- Build frontend features, reusable components, and libraries using React and TypeScript.
- Translate designs and wireframes into high-quality code and optimize performance across browsers and devices.
- Collaborate with fullstack and backend developers and UX/UI designers to improve usability.
What they ask for
- Extensive frontend engineering experience and 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; clear communication and ability to thrive in a fast-paced startup environment.
Nice to have
- A degree in computer science or a related field.
- Passion for user experience, design, and building clean, engaging, intuitive interfaces.
Pay
$180,000-$240,000 USD (annual salary range; base salary or total pay not specified)
Tools
React, Typescript, JavaScript, Babel, Vite, Webpack, NPM, Yarn
AI focus
Build frontend features for an LLM application observability, testing, and debugging platform.
Model-written summary · the original posting is authoritative