Is the Senior Frontend Engineer, AI Observability & Evals Platform role remote?

No — this is an on-site role in San Francisco, CA.

What's the salary range?

LangChain lists $175,000–$225,000 for this role.

Where is the role based?

LangChain is hiring for this position in San Francisco, CA.

What's the tech stack?

Joblaze extracted these technologies from the posting: TypeScript, Vite, JavaScript, Webpack, Yarn, React.

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, AI Observability & Evals Platform 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 LLM application observability and debugging. Proficiency in React, TypeScript, and modern front-end tools is essential, along with experience collaborating with backend developers and UX/UI designers. This position is ideal for someone with extensive front-end experience who thrives in a fast-paced startup environment and possesses strong communication skills. LangChain is in a growth phase, having recently secured significant funding, which allows for impactful contributions from all team members.

Joblaze insights

Listed about a month ago on Joblaze — tracked directly from LangChain's career page.
LangChain has 101 other open roles including Enterprise Account Executive (Minneapolis), Web Lead, Commercial Sales Director - East.
501 active TypeScript roles on Joblaze right now.
500 active JavaScript roles on Joblaze right now.
443 active React roles on Joblaze right now.
Salary band is in line with the typical range for Frontend (median ~$192,000).

Quick facts

Is the Senior Frontend Engineer, AI Observability & Evals Platform role remote?: No — this is an on-site role in San Francisco, CA.
What's the salary range?: LangChain lists $175,000–$225,000 for this role.
Where is the role based?: LangChain is hiring for this position in San Francisco, CA.
What's the tech stack?: Joblaze extracted these technologies from the posting: TypeScript, Vite, JavaScript, Webpack, Yarn, React.
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, AI Observability & Evals Platform role at LangChain.

From the original posting

About Us

At LangChain, our mission is to make intelligent agents ubiquitous. We build the foundation for agent engineering in the real world, helping developers move from prototypes to production-ready AI agents that teams can rely on. We began as widely adopted open-source tools and have grown to also offer a platform for building, evaluating, deploying, and operating agents at scale.

With $125M raised at Series B from IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we’re at a stage where we’re continuing to develop new products, growth is accelerating, and all team members have meaningful impact on what we build and how we work together. LangChain is a place where your contributions can shape how this technology shows up in the real world.

Today, our platform includes LangSmith (Observability, Evaluation, Deployment, Fleet, and Sandboxes), our open source frameworks (LangChain, LangGraph, and Deep Agents), and the newly launched LangSmith Engine for autonomous agent improvement. We have 100M+ monthly open source downloads, 6,000+ active LangSmith customers, and 5 of the Fortune 10 use LangSmith in production (+ 35% of the Fortune 500 overall), including teams at Klarna, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, LinkedIn, Monday.com, Nvidia, and Bridgewater.

About the role

(In person 5 days/week in San Francisco, CA, New York, 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

Compensation Philosophy:

We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Actual compensation and offerings will vary based on role, level, and location. 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.