# Senior Frontend Engineer, AI Observability & Evals Platform

**Company:** [LangChain](https://hotfix.jobs/companies/langchain)
**Location:** San Francisco, CA, Boston, MA, New York, NY
**Role:** Frontend Engineering
**Salary:** $175k – $225k/yr
**Skills:** React, TypeScript, JavaScript, Babel, Vite, webpack, Npm, Yarn, REST APIs, Jwt
**Posted:** 2026-08-13

> Develops and enhances user-facing features for LangSmith, an AI observability platform using React and TypeScript. Requires extensive frontend experience, build tools proficiency, API integration, and strong collaboration skills in a fast-paced startup.

## Job Description

## What You Will Do
- 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

## You’re a good fit if you have
- 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

## Compensation & Benefits
- Annual salary range: **$175,000-$225,000 USD**
- Competitive compensation that includes base salary, meaningful equity, and benefits such as health and dental coverage, flexible vacation, a 401(k) plan, and life insurance.

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