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Senior Fullstack Software Engineer, AI Observability & Evals Platform (NY)

LangChainSan Francisco, CAEngineering
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Salary
$175K-$240K USD
Job type
Full-time
Experience
Senior · 5+ yrs
Posted
8 Oct 2026
Status
Open · checked 7d ago

About this role

This position suits software engineers with significant platform experience who want to build observability and evaluation systems in San Francisco, California. The role involves designing and scaling commercial product features for LangSmith while collaborating with enterprise customers and internal teams.

Role Overview

LangChain is hiring a Senior Fullstack Software Engineer for the AI Observability and Evals Platform team in San Francisco, California. The position focuses on shaping the technical direction of LangSmith, a commercial product for observability, evaluation, and deployment.

Key Responsibilities

Lead the technical architecture and implementation of key product features across the Go, Python, and TypeScript stack.
Collaborate with product and design teams to build and iterate on new features.
Mentor junior team members and drive project timelines while maintaining high engineering standards.
Write clean, maintainable, and well-tested code.

Requirements

Five or more years of software engineering experience working on complex platform products.
Fullstack development experience with Go or Python on the backend and React and TypeScript on the frontend.
Understanding of database systems, specifically Postgres and Redis.
Experience designing and scaling APIs in high-performance, data-intensive applications.
Strong communication skills and an ownership mindset.

Nice to Have

Experience with AI or LLM-powered applications, developer tools, or observability platforms.

Skills and Tools

Go
Python
TypeScript
React
Postgres
Redis

Salary and Benefits

The annual salary range is $175,000 to $240,000 USD. Additional benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, and meals on in-office days in the US.

About the Company

LangChain builds the foundation for agent engineering with the mission to make intelligent agents ubiquitous. The platform includes LangSmith, open-source frameworks like LangChain, LangGraph, and Deep Agents, and the LangSmith Engine. The company has raised $125 million at Series B from investors such as IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures.

How to Apply

Candidates should apply on the official LangChain careers page.

Skills and tech stack

GoPythonTypeScriptReactPostgresRedisLangChainLangGraphLangSmithLLM

Questions candidates ask

What is the location of the role?

The role is located in San Francisco, California.

What is the salary range for this position?

The annual salary range is $175,000 to $240,000 USD.

How many years of experience are required?

Candidates must have 5+ years of experience in software engineering working on complex platform products.

What technology stack does the role use?

The tech stack includes Go, Python, React, TypeScript, Postgres, and Redis.

What benefits are included?

Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, and meals on in-office days in the US.

Ready to apply?

The application is on the official LangChain careers page.

Apply on company site