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Senior Frontend Engineer

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

Boston, MA

Status

Open

Posted

2026-09-24T19:22:18.136+00:00

LangChain is hiring a senior frontend engineer for its LangSmith team, which builds the company's platform for observability, evaluation and production reliability of AI systems. The role is onsite in Boston and centres on user-facing React and TypeScript features, reusable component libraries, translating designs into code, and performance work across browsers, in collaboration with fullstack engineers and designers. The posting asks for extensive React, JavaScript and TypeScript experience, build-tool familiarity, REST API and JWT knowledge, and comfort in a fast-paced startup where the team owns LangSmith end to end.