Senior Frontend Engineer, AI Observability & Evals Platform

San Francisco, CA💼 Full-time💰 $175,000–$175,000🗓 2026-08-13 → 2026-09-26

Core

Develop and enhance user-facing features for LangSmith, an enterprise platform for LLM application observability, testing, and debugging.

Role type

Senior Frontend Engineer

Builds

Reusable components and front-end libraries for LangSmith

Domain

AI/LLM platform development

Deliverable

product features

Required skills

React, TypeScript, JavaScript, Babel, Vite, Webpack, NPM, Yarn, REST APIs, JWT

Preferred skills

UX/UI design, clean code architecture, startup adaptability, ownership mindset

Technologies

React, TypeScript, JavaScript, Babel, Vite, Webpack, NPM, Yarn

Responsibilities

Develop new user-facing features, build reusable components, translate designs into code, optimize component performance, collaborate with fullstack/backend developers and UX/UI designers

Seniority

Senior, hands-on IC

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About LangChain

Technology, Information and Internet361San Francisco, CA, US

At LangChain, our mission is to make intelligent agents ubiquitous. We build the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents that teams can rely on. What began as widely adopted open-source tools has grown into a platform for building, evaluating, deploying, and operating agents at scale. LangChain provides the agent engineering platform and open source frameworks developers need to ship reliable agents fast. LangSmith offers observability, evaluation, and deployment for rapid iteration. Our open source frameworks, L