Senior Frontend Engineer, Observability & Evals Platform (LangSmith)

About LangChain

At LangChain, our mission is to make intelligent agents ubiquitous. We help developers build mission-critical AI applications across the entire agent development lifecycle. Our open source frameworks — LangChain and LangGraph — see over 70+ million downloads per month. Developers rely on LangChain for composable integrations and LangGraph for controllable agent orchestration. Our commercial agent platform, consisting of LangSmith and LangGraph Platform, enables teams to build, test, run, and manage agents at scale across their organization.

Founded in 2023, LangChain powers top engineering teams at companies like Replit, Lovable, Clay, Klarna, , and more.

About the role :

In person 5 days / week in San Francisco, CA, New York, Boston, London, or Amsterdam

We’re looking to add a frontend engineer to develop and enhance new features on LangSmith, working on our enterprise platform product for LLM application observability, testing, and debugging. You will :

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 a vast array of web-capable devices and browsers

Collaborate with fullstack and backend developers and UX / UI designers, to enhance usability

In this role, you’re a good fit if you have :

Front-end engineering experience with strong proficiency in React, JavaScript and Type

Script

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

Compensation & Benefits :

Competitive salary and equity stake for role and stage of company. Commensurate with experience.

Annual salary range : $155,000-$195,000 USD

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