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# Fullstack Engineer, AI Observability & Evals Platform

- **Company:** Langchain Inc.
- **Location:** San Francisco, CA, United States
- **Experience:** Expert
- **Salary:** $175,000.0 - $240,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Databases, Programming Tools, Python (Programming Language), PostgreSQL, Open Source Technology, Redis, Software Engineering, TypeScript, Scripting, ReactJS, Backend, Juniper, Front End Software Development, Golang
- **Published:** July 31, 2026
- **Apply:** https://www.careerbuilder.com/job-details/senior-fullstack-engineer-ai-observability-evals-platform-san-francisco-ca--c832e94d-0b59-4ea7-9266-166e0fe19033

## About the Role

* 5+ years of experiencein 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
 * Strong ownership mindset
 * Bonus: Experience with AI/LLM-powered applications, developer tools, or observability platforms, Application Programming Interface (API), Artificial Intelligence (AI), Artificial Intelligence (AI) Agents, Benchmarking, Communication Skills, Database Technology, Fortune 500 Customers, Juniper Networks M-Series, LinkedIn, Mentoring, Open Source, PostgreSQL, Product Design, Product Development, Programming Tools, Prototyping, Python Programming/Scripting Language, Redis, Software Agents, Software Development, Software Engineering, Team Player, Vehicle Fleets

## Description

We're looking for a Senior Fullstack Engineer for our commercial product LangSmith, an observability and evals platform. In this role, you'll have the opportunity to shape the technical direction of our platform while working closely with enterprise customers, developer end-users and internal stakeholders.
What You Will Do

 * Lead the technical architecture and implementation of key product features for LangSmith, working across our entire Go, Python, and Typescript stack.
 * Collaborate closely with product and design teams to iterate on new features.
 * Mentor and guide more junior members of the team. Drive aggressive project timelines while ensuring high engineering standards are being met.
 * Lead by example in writing clean, maintainable, and well-tested code


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