Scaling DevTools Sam Bhagwat from Mastra: the Gatsby founder building an agents framework
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Jul 24, 2025 Sam Bhagwat, CEO of Mastra and co-founder of Gatsby, discusses his journey in building AI frameworks. He reveals why they chose TypeScript over Python and the surprising engagement from Japanese developers. Sam shares insights on localizing resources and the impact of community feedback on product evolution. They also delve into the significance of high-quality documentation in user experience, and the distribution of 1,500 physical books a week to bridge knowledge gaps in AI development.
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Mastra's Unexpected Japan Success
- Mastra became viral in Japan due to Japanese devs being active on DevTwitter and tech blogs.
- 20% of Mastra users are in Japan, prompting Japanese documentation translation.
TypeScript Overtakes Python for AI Agents
- AI agent development is shifting from Python to TypeScript as new developers enter the space.
- Majority of startups in recent YC batches now prefer TypeScript for building AI agents.
Use Docs and Changelogs for Growth
- Maintain excellent, up-to-date docs and changelogs to show ongoing project vitality.
- Use social proof like user stories and share progress regularly to encourage adoption.