Senior Frontend Engineer, AI Observabilty Platform

ABOUT US

At LangChain, our mission is to enable every company to own its intelligence. We believe agents will transform how companies operate, and we're building the foundation to make that future possible. Our open-source harnesses and LangSmith platform give developers and enterprises the infrastructure to run, improve, and govern agents at scale.

We've raised $460M to date, with our most recent funding round valuing the company at $3B, backed by leading investors including Sequoia, Benchmark, IVP, and CapitalG. As we continue to expand our platform and tackle some of the hardest challenges in agent engineering, every team member has the opportunity to make a meaningful impact and help shape both our technology and the future of the industry.

More than 7,000 organizations rely on LangSmith, from fast-growing startups to Fortune 500 enterprises, including NVIDIA, Bridgewater, LinkedIn, Workday, and Rippling. We're just getting started on making high-performing agents easier to build and manage at scale.

ABOUT THE TEAM

The LangSmith team owns and builds LangChain's core platform for observability, evaluation, and production reliability of AI systems. From tracing and annotation to run rules, evaluations, and beyond, this team owns LangSmith end-to-end. If you want to define what great AI observability looks like at production scale, this is where that work gets done.

ABOUT THE ROLE

(Onsite in Boston)

We’re looking to bring on an experienced frontend engineer to develop and enhance new features on LangSmith, our enterprise platform product for LLM application observability, testing, and debugging.

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

WHAT YOU WILL BRING

- 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

Annual salary range: $170,000-$235,000 USD

COMPENSATION PHILOSOPHY:

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks.

We are hiring for this role across a range of scope, and the compensation band reflects that. Your offer depends on what we learn about your impact, craft, leadership, and communication during the interview process. We will tell you early where you’re tracking and talk comp with you before offer stage. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.

BENEFITS

Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.