FullStack Engineer, AI Observability & Evals Platform (LangSmith)

LangChain
San Francisco, New York, Boston, Cambridge
Workplace: OnsiteFull timeUSD 145,000 - 180,000 annuallyFunction: Software EngineeringExperience: 2+ yearsSkills: ["Communication","Collaboration","Ownership","Problem-solving","Fast iteration"]

We are seeking a Fullstack Engineer to build LangSmith, the observability and evals platform for LangChain. You’ll develop features across Go, Python, and TypeScript stacks, collaborate with product/design, and ship high-quality, scalable APIs for enterprise customers and developers, while iterate quickly based on user feedback in a fast-paced, collaborative environment.

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LangChain
LangChain
1 year ago

FullStack Engineer, AI Observability & Evals Platform (LangSmith)

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Source: Company careers pageValidated by: Fursa AI
Last checked: 15 hours agoStatus: Live

Job Summary

We are seeking a Fullstack Engineer to build LangSmith, the observability and evals platform for LangChain. You’ll develop features across Go, Python, and TypeScript stacks, collaborate with product/design, and ship high-quality, scalable APIs for enterprise customers and developers, while iterate quickly based on user feedback in a fast-paced, collaborative environment.
Location: San Francisco, New York, Boston, Cambridge
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering

Key Responsibilities

  • •Develop and implement key product features across Go, Python, and TypeScript stack
  • •Collaborate closely with product and design teams to iterate on new features and enhance the product roadmap
  • •Drive aggressive project timelines while ensuring high engineering standards by writing clean, maintainable, and well-tested code
  • •Ship features that scale APIs and data-intensive applications with a focus on quality and reliability
  • •Engage with internal stakeholders and top-tier customers to gather feedback and inform product direction

Pay and Benefits

Salary: USD 145,000 - 180,000 annually
Perks:Health InsuranceDental401kLife InsurancePaid Leave

Key Requirements

  • •2+ years of experience in software engineering working on complex platform products
  • •Fullstack engineering experience with Go or Python on the backend and React + TypeScript on the frontend
  • •Solid understanding of database systems, particularly Postgres and Redis
  • •Experience designing and scaling APIs, preferably in high-performance, data-intensive applications
  • •Strong ownership and a “get stuff done” mindset - comfortable shipping fast and iterating based on user feedback
Experience:2+ yearsSaaSAI toolingObservabilityDeveloper tools
Skills:CommunicationCollaborationOwnershipProblem-solvingFast iteration
Tech Stack:GoPythonTypeScriptReactPostgreSQLRedisAPIs

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