Senior Frontend Engineer, AI Observability & Evals Platform

Langchain
San Francisco +1 more
HybridCareer-pivot friendly

Who this role is best for

Aimed at senior frontend engineers with a strong technical background in React and TypeScript who thrive in fast-paced environments and can contribute to shaping enterprise AI platforms.

Best fit for

  • Senior frontend engineers with a history of building scalable enterprise platforms and cross-functional collaboration experience
    — “Collaborate with fullstack and backend developers and UX/UI designers, to enhance usability
  • Candidates with a strong ownership mindset and a track record of defining impactful work in unstructured environments
    — “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
  • Individuals with a proven ability to translate design concepts into functional frontend code efficiently
    — “Translate designs and wireframes into high-quality code

Things to consider

  • In-office presence required for 5 days/week in San Francisco, New York, or Boston
    — “(In person 5 days/week in San Francisco, CA, New York, Boston )
  • Candidates must be prepared to work on a product with significant enterprise and Fortune 1000 client exposure
    — “5 of the Fortune 10 use LangSmith in production (+ 35% of the Fortune 500 overall)

How to stand out

  • Highlight experience with enterprise-grade frontend development and large-scale platform optimization
    — “Optimize components for maximum performance across a vast array of web-capable devices and browsers
  • Showcase a history of building reusable frontend components and libraries for long-term use
    — “Build reusable components and front-end libraries for future use
  • Demonstrate strong communication skills by providing examples of explaining complex technical ideas to non-technical stakeholders
    — “Strong written and oral communication skills, with the ability to explain technical concepts clearly and concisely to both technical and non-technical stakeholders
Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · TeamLevel · Senior

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • Developing new user-facing features
  • Optimizing components for performance
Typical background
Extensive front-end engineering experience

Skills & requirements

Required

ReactTypeScriptFront-end DevelopmentComponent DevelopmentUser Interface DesignCollaboration With Ux/ui Designers

Preferred

REST ApisJwtsUser Experience Design

Stack & domain

ReactJavaScriptTypeScriptREST ApisCommunicationProblem-solvingTeamworkFrontend DevelopmentAI Observability

About the role

Original posting from Langchain via Ashby

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.

Source: Langchain careers (Ashby)

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