Senior Frontend Engineer, AI Observability & Evals (Remote)

Zekai; United States; Remote; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical, dental, vision

401(k) plan

Flexible vacation

Meals on in-office days

Job summary

LangChain is seeking an experienced frontend engineer to build and enhance features for LangSmith, our enterprise platform for LLM observability, testing, and debugging. The role supports a remote-first environment with US-based applicants and a strong emphasis on user-centered design.

You will collaborate with backend teams, UX/UI designers, and other engineers to deliver scalable, high-performance interfaces across browsers and devices.

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.

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 a vast array of web-capable devices and browsers.
• Collaborate with fullstack and backend developers and UX/UI designers, to enhance usability.

Skills

React

JavaScript

TypeScript

UX/UI

Communication

CS fundamentals

JWTs

Education

Bachelor's in Computer Science

Tools

Babel

Vite

Webpack

NPM

Yarn

Job description

LangChain is seeking an experienced frontend engineer to build and enhance features for LangSmith, our enterprise platform for LLM observability, testing, and debugging. The role supports a remote-first environment with US-based applicants and a strong emphasis on user-centered design.

You will collaborate with backend teams, UX/UI designers, and other engineers to deliver scalable, high-performance interfaces across browsers and devices.