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Senior Frontend Engineer, AI Observability & Evals Platform

LangChainSan Francisco, CAEngineering
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Salary
$175K - $240K USD
Job type
Full-time
Posted
13 Aug 2026
Status
Open · checked 7d ago

About this role

LangChain is seeking a Senior Frontend Engineer to join the team in San Francisco, CA, to build and enhance user-facing features for the LangSmith platform. This full-time position is ideal for an experienced developer with a strong background in React, TypeScript, and modern front-end technologies who thrives in a fast-paced start-up environment.

Role Overview

This position involves building and improving features for LangSmith, the enterprise platform product dedicated to large language model application observability, testing, and debugging. The role is based in-person five days a week in San Francisco, California. The person in this position will work closely with designers and backend developers to create intuitive interfaces for real-world AI agent development tools.

Key Responsibilities

Build brand new user-facing features utilizing TypeScript and React.
Create reusable front-end libraries and components for future application.
Convert design wireframes into clean, high-performance code.
Ensure optimal performance of web components across multiple browsers and devices.
Work in collaboration with UX/UI designers as well as backend and full-stack engineers to improve product usability.

Requirements

Extensive professional front-end engineering experience demonstrating deep proficiency in JavaScript, React, and TypeScript.
Practical experience using front-end development tools like Yarn, NPM, Vite, Webpack, and Babel.
Working knowledge of REST APIs and experience collaborating directly with back-end and full-stack personnel.
Understanding of modern authorization protocols, including JSON Web Tokens (JWTs).
Strong communication skills to articulate technical ideas clearly to technical and non-technical team members.
An ownership mindset, self-driven attitude, and the ability to excel within an unstructured, fast-paced start-up atmosphere.
Solid computer science fundamentals, ideally backed by a degree in computer science or a related discipline.

Skills and Tools

React
TypeScript
JavaScript
LLM technologies
LangChain
Front-end tooling (Babel, Vite, Webpack, NPM, Yarn)
REST APIs and JWTs

Salary and Benefits

Annual salary range of $175,000 to $240,000 USD.
Comprehensive health coverage including medical, dental, and vision insurance.
Flexible vacation policy and a 401(k) retirement plan.
Meals provided on in-office days for US employees.
Meaningful equity and competitive compensation package.

About the Company

LangChain aims to make intelligent agents ubiquitous by providing the foundation for agent engineering in real-world applications. Starting as open-source tooling, the organization now offers a comprehensive platform for building, evaluating, and operating agents at scale. Backed by major investors like Sequoia, IVP, Benchmark, CapitalG, and Sapphire Ventures, the company powers production use cases for thousands of active customers, including multiple Fortune 10 enterprises.

How to Apply

Interested candidates should visit the official LangChain careers page to submit an application for this position.

Skills and tech stack

ReactTypeScriptJavaScriptLLMLangChain

Questions candidates ask

Where is this job located?

This position is based in-person five days a week in San Francisco, California.

What is the salary range for the Senior Frontend Engineer role?

The annual salary range is $175,000 to $240,000 USD, supplemented by equity, benefits, and perks.

What core technical skills are required?

Candidates must have extensive front-end engineering experience with strong proficiency in React, JavaScript, and TypeScript, along with familiarity with REST APIs and build tools like Webpack and Vite.

What benefits are offered to US employees?

US team members receive medical, dental, and vision coverage, flexible vacation, a 401(k) plan, and meals on in-office days.

How do I apply for this position?

You can apply directly on the official company careers page.

Ready to apply?

The application is on the official LangChain careers page.

Apply on company site