Senior Frontend Engineer, AI Observability & Evals Platform

LangChain
San Francisco, New York, Boston, United States, Cambridge
Workplace: OnsiteFull timeUSD 175,000 - 240,000 annuallyFunction: Software EngineeringSkills: ["Communication","Ownership mind-set","Stakeholder management","User experience focus","Adaptability"]

Build and enhance user-facing features for an enterprise platform focused on LLM application observability, testing, and debugging. Develop reusable React and TypeScript components and front-end libraries, translate designs into production-quality code, and optimize performance across devices and browsers. Partner closely with fullstack and backend engineers and UX/UI designers to improve usability and ship impactful improvements to the LangSmith platform.

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FursaFursa
LangChain
LangChain
1 year ago

Senior Frontend Engineer, AI Observability & Evals Platform

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 19 hours agoStatus: Live

Job Summary

Build and enhance user-facing features for an enterprise platform focused on LLM application observability, testing, and debugging. Develop reusable React and TypeScript components and front-end libraries, translate designs into production-quality code, and optimize performance across devices and browsers. Partner closely with fullstack and backend engineers and UX/UI designers to improve usability and ship impactful improvements to the LangSmith platform.
Location: San Francisco, New York, Boston, United States, Cambridge
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Develop new user-facing features using React and 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 wide range of browsers and web-capable devices.
  • •Collaborate with fullstack and backend developers and UX/UI designers to enhance usability.

Pay and Benefits

Salary: USD 175,000 - 240,000 annually
Perks:MedicalDentalVision401k

Key Requirements

  • •Extensive front-end engineering experience with strong proficiency in React, JavaScript, and TypeScript.
  • •Hands-on experience with front-end development tools such as 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.
  • •Strong computer science fundamentals, ideally with a degree in computer science or a related field.
Experience:LLMAIEnterprise SaaSObservabilityDebugging
Education:
Skills:CommunicationOwnership mind-setStakeholder managementUser experience focusAdaptability
Tech Stack:ReactTypeScriptJavaScriptBabelViteWebpackNPMYarnREST APIsJWTWeb performance

Company Brief

LangChain
Provides an open-source framework and commercial platform (LangSmith/LangGraph) for building, testing, monitoring, and deploying LLM-powered applications and agentic AI for developers and enterprises.
Industry: Developer Tools
Company Size: Medium (51 to 250 employees)
Revenue: USD 10M to 25M
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series B
Headquarters: San Francisco, United States
Founded: 2022
WebsiteLinkedIn