Senior Frontend Engineer, AI Observability & Evals Platform
LangChain
Senior Frontend Engineer, AI Observability & Evals Platform at LangChain is a full time role based in United States. The listing states pay of $175k–$240k. It was published on 13 August 2026 and was open at last check.
| Role | Senior Frontend Engineer, AI Observability & Evals Platform |
|---|---|
| Company | LangChain |
| Location | United States |
| Employment type | Full Time |
| Pay (as listed) | $175k–$240k |
| Published | 13 August 2026 |
| Status | Open at last check |
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.
Create your free OnJob profile to apply — we'll take you to LangChain's application after sign-up. · Posted 13 Aug 2026.
Senior Frontend Engineer, AI Observability & Evals Platform at LangChain — questions answered
What does the Senior Frontend Engineer, AI Observability & Evals Platform role at LangChain pay?
The Senior Frontend Engineer, AI Observability & Evals Platform at LangChain listing states pay of $175k–$240k for the United States position. That figure is taken directly from the employer's own posting as published, not estimated or averaged from other roles.
Where is the Senior Frontend Engineer, AI Observability & Evals Platform role at LangChain based?
LangChain lists this Senior Frontend Engineer, AI Observability & Evals Platform role in United States, advertised as full time work at that location. Larger employers sometimes cover several sites under one city name, so confirm the exact office with LangChain before you apply.
Is the Senior Frontend Engineer, AI Observability & Evals Platform role at LangChain still open?
The Senior Frontend Engineer, AI Observability & Evals Platform posting at LangChain was open at OnJob's last check of the employer's careers page, having been published on 13 August 2026. OnJob re-checks source listings on each build and marks a role closed once it disappears, but listings can close without notice, so the employer's own page is the final word.
How do you apply for the Senior Frontend Engineer, AI Observability & Evals Platform role at LangChain?
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