Is the Senior Frontend Engineer role remote?

No — this is an on-site role in Boston, MA.

What's the salary range?

LangChain lists $175,000–$240,000 for this role.

Where is the role based?

LangChain is hiring for this position in Boston, MA.

What's the tech stack?

Joblaze extracted these technologies from the posting: Babel, JavaScript, NPM, React, TypeScript, Vite.

What seniority level is this role?

LangChain targets senior candidates for this position.

Is this full-time or contract?

Full-time for this Senior Frontend Engineer role at LangChain.

Joblaze summary

In this role, the Senior Frontend Engineer at LangChain focuses on developing and enhancing user-facing features for the LangSmith platform, which supports observability and debugging of AI applications. Key skills include proficiency in React, TypeScript, and familiarity with front-end development tools and REST APIs. This position is ideal for someone with extensive frontend experience who thrives in a fast-paced startup environment and possesses strong communication skills to collaborate effectively with cross-functional teams. The LangSmith team is integral to defining AI observability at scale, making this a pivotal role in the company's growth.

Joblaze insights

Listed yesterday — first seen on Joblaze September 25, 2026. Last confirmed on LangChain's careers page September 26, 2026.
Salary band is in line with the typical range for Frontend roles (median ~$180,000).
Starts above 35% of 43 comparable senior frontend roles in United States that list React we track (median $186,065 across 29 companies). See React salary trends
React appears in 81.2% of 69 comparable senior frontend roles in United States; NPM appears in 1.4% of 69 comparable senior frontend roles in United States.

Quick facts

Is the Senior Frontend Engineer role remote?: No — this is an on-site role in Boston, MA.
What's the salary range?: LangChain lists $175,000–$240,000 for this role.
Where is the role based?: LangChain is hiring for this position in Boston, MA.
What's the tech stack?: Joblaze extracted these technologies from the posting: Babel, JavaScript, NPM, React, TypeScript, Vite.
What seniority level is this role?: LangChain targets senior candidates for this position.
Is this full-time or contract?: Full-time for this Senior Frontend Engineer role at LangChain.

From the original posting

About Us

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

Compensation

Annual salary range: $175,000-$240,000 USD

Standard company text repeated across LangChain's postings is omitted here.