building @mastra. author principles of building ai agents, the "most popular book in SF right now". prev cofounder @gatsbyjs
San Francisco, CA
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We’re excited to announce today that @mastra has raised a $22M Series A led by Spark Capital.
This brings our total capital raised to $35M:
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demo by @abhiaiyer:
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Super fun convo at @WeAreDevs yesterday
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Spanish unicorn @factorialapp built an agent across 25+ products for 17k+ customers.
The toughest part: configuring perms to access HR data. They had the agent call the same GraphQL API as the frontend, essentially inheriting user permissions.
Here's CTO @somebody32:
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Our Jev workshop is in a couple hours. 500+ people signed up since Tu: luma.com/mastra-dwi3
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Built with Mastra
We've reached a big milestone as one of the fastest growing wealth advisors in the country: Range has surpassed $1 billion in assets under management.
This is a huge checkpoint, but just the beginning of our journey as we scale to serve millions of households across the country.
A huge thanks to our members, our team of incredible Rangers, our custodial partner @Altruist, and our investors at @scalevp @gradientvc @cathayinnov @expa @redseaventures @53stations and @8bitcapital
We have more exciting announcements coming soon... Stay tuned.
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Mastra for civic engagement:
I have spent most of the day working on my Milwaukee Budget Decoder web app. It takes the Mayor's proposed 2027 budget and turns it into a civic engagement tool that helps Milwaukeeans understand what's in the budget and how it affects them.
I built it with Claude Code using their latest model, Opus 5.5. I built a RAG system for the budget documents, which is hosted by Neon in a vector database.
I included a feature for Milwaukeeans to provide a 'tax receipt' based on where you live (connected to MPROP data from the city).
I also built an agent powered by the Mastra agent framework that integrates with a generative UI chat interface powered by @CopilotKit and OpenUI. Frontend hosted on @Vercel.
The site will be live soon. The code will be open-source and available on GitHub. It also works on smartphones!
#civictech
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In the 72 hours after Jev dropped, we shipped a workflows classifier, tool approval classifier checks, classifier as judge scorers, and a classifier as a processor. Thinking about a model router too.
Come hang out and chat w/ us about it on Th:
luma.com/mastra-dwi3
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