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Senior Frontend Engineer, AI Observabilty Platform

LangChain· Engineering
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Boston, MA$170k - $235kFull-timePosted 3w ago

About the role

Senior frontend engineer to develop and enhance features on LangSmith, LangChain's enterprise platform for LLM observability, testing, and debugging. Onsite in Boston, contributing to a fast-paced startup environment.

Responsibilities

  • Develop new user-facing features using React & Typescript
  • Build reusable components and front-end libraries for future use
  • Translate designs and wireframes into high-quality code
  • Optimize components for maximum performance across devices and browsers
  • Collaborate with fullstack and backend developers and UX/UI designers, to enhance usability

Qualifications

  • Extensive front-end engineering experience with strong proficiency in React, JavaScript and TypeScript
  • Hands-on experience with front-end development tools like Babel, Vite, Webpack, NPM, and Yarn
  • Familiarity with REST APIs and experience working closely with fullstack and backend engineers
  • Knowledge of modern authorization mechanisms, such as JWTs
  • A passion for user experience, design and building clean, engaging, and intuitive interfaces
  • Strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders
  • The DNA to thrive in a start-up, fast-paced environment. Views unstructured environments as an opportunity to figure out the most impactful work and help define the future success of the company
  • An ownership mind-set. You are self-driven and look for opportunities to make an impact.
  • Strong computer science fundamentals, ideally with a degree in computer science or related field

Skills

Required:ReactTypeScriptJavaScriptREST APIs

Benefits

  • Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.
Last updated Oct 14, 2026. Interested? Apply on the company site.

About LangChain

Engineer reliable agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

AI agentsagent engineeringbrex-fastest-growing-2025liquid-ai-recruiting-targetopen source frameworksplatform
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