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Senior Frontend Engineer, AI Observability & Evals Platform

About UsAt 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. We be

Company

LangChain

Location

San Francisco, CA; Boston, MA; New York, NY

Status

Open

Posted

2026-08-13T18:33:10.038+00:00

LangChain is hiring a senior frontend engineer to build features for LangSmith, its platform for LLM application observability, testing and debugging. The work covers React and TypeScript user-facing features, reusable components and front-end libraries, translating designs into code, and optimizing performance across browsers, in collaboration with fullstack, backend and UX colleagues. The posting asks for extensive front-end experience, JavaScript/TypeScript and React proficiency, build tooling, REST APIs and JWTs. It is in person five days a week in one of three US offices, with a stated range of $175,000–$240,000.