# Senior Fullstack Engineer, AI Observability & Evals Platform at LangChain

- Company: LangChain
- What the company does: LangChain enables every company to own their intelligence. Control, govern, and compound intelligence with an open agent engineering platform. Backed by Sequoia, IVP and Lux.
- Company website: https://www.langchain.com/
- Type: Startups (AI role)
- Level: Senior
- Location: Boston, MA
- Work setup: On-site
- Pay: $175K to $240K base salary per year (USD)
- Posted: 2026-09-12
- Apply by: 2026-10-27
- Apply: https://jobs.ashbyhq.com/langchain/e6d2bc1e-e0b9-4076-be01-ef8681863c01
- Page: https://www.1752.vc/careers/jobs/langchain-senior-fullstack-engineer-ai-observability-and-evals-platform/

## About the role

We're looking for a Senior Fullstack Engineer to work on LangSmith. In this role, you'll have the opportunity to shape the technical direction of our platform while working closely with our enterprise customers, developer end-users, and cross functional internal stakeholders. Lead the technical architecture and implementation of key product features for LangSmith, working across our entire Go, Python, and Typescript stack.

## What they're looking for

- 5+ 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
- Strong understanding of database systems, particularly Postgres and Redis
- Experience designing and scaling APIs, preferably in a high-performance, data-intensive application
- A “get stuff done” attitude - comfortable shipping fast and iterating based on user feedback
- Strong communicator with the ability to collaborate closely with various internal stakeholders and engage directly with our top-tier customers

Tags: Engineering