# Senior Fullstack Engineer,  AI Observability & Evals Platform

Hiring organization: [LangChain](https://career.thegoodapps.co/organizations/langchain)

Canonical page: https://career.thegoodapps.co/jobs/fe7d5d90-ac37-4cd1-b52d-b520f2c9202d

Listed on LangChain's own careers site. Applications go to them directly.

- Employment type: full time
- Seniority: Senior
- Location: Boston, NY
- Salary: 175000 – 240000 USD per year

## Summary

Senior fullstack engineer role building LangSmith, an AI observability and evaluation platform used by major enterprises. This position suits experienced engineers who want to shape product architecture across Go, Python, and TypeScript while mentoring teammates and engaging directly with customers.

_Our summary, not LangChain's wording._

## Skills named

API Design, Go, PostgreSQL, Python, React, Redis, TypeScript

## Required

- 5+ years building complex platform products
- Fullstack experience with Go or Python backend and React + TypeScript frontend
- Strong PostgreSQL and Redis knowledge
- API design and scaling experience in high-performance, data-intensive systems
- Shipping velocity and iteration mindset
- Cross-functional collaboration and stakeholder communication
- Ownership-driven approach

## Nice to have

- AI/LLM application experience
- Developer tools platform experience
- Observability platform experience

Apply on LangChain's site: https://jobs.ashbyhq.com/langchain/a03b3e54-495d-4960-aee7-0194a3cef57d/application