Mastra

The Javascript framework for building AI agents, from the Gatsby devs

Y CombinatorWinter 2025ActiveB2BEngineering, Product and DesignArtificial IntelligenceDeveloper ToolsOpen SourceAI

What they do

Problem

Building production-ready AI agent applications is complex, requiring robust workflows, knowledge integration, memory/tooling, and quality evaluation.

Solution

Mastra is an open-source TypeScript/JavaScript framework providing AI primitives (agents, workflows, RAG, evals) to build and deploy production AI applications on any cloud.

Who it's for

Product developers and engineering teams building AI-powered applications and agents.

Founders

Sam Bhagwat

Founder

Founder/CEO of Mastra. Spent last ~8yrs as cofounder of Gatsby.js, an open-source React website framework, scaled to $5M ARR, sold to Netlify. Eng <20 at Zenefits (W13) and Plangrid (W12). Spent two years knocking doors. Stanford '11.

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Abhi Aiyer

Founder

Founder/CTO of Mastra. Principal eng & lead of >100 person eng org at Netlify. Built Gatsby Cloud infra that ran 10s of thousands of build nodes, served billions of files, and 100s of TB of monthly bandwidth.

LinkedIn · X

Shane Thomas

Founder

Founder/CPO of Mastra. Prev: built Audiofeed (AI podcasting). Staff eng / head of product @ Gatsby. 15+ years in open source. State wrestling champion.

LinkedIn · X