Marvin Frachet

Frontend lead and core contributor at Mastra, an open-source TypeScript framework for building AI applications with 20k+ GitHub stars.

I lead the development of Mastra Studio, the product interface used to build, inspect, and manage AI agents. I also contribute heavily to the Mastra PaaS platform, the hosted product that turns the open-source framework into a monetizable SaaS offering by allowing companies to deploy and run Mastra applications at scale.

My current focus is the Agent Builder, an AI-powered enterprise feature that helps users create and configure agents more efficiently. This feature is part of Mastra’s Enterprise Edition and contributes directly to the company’s revenue strategy.

This work places me at the intersection of developer experience, AI application infrastructure, frontend architecture, and revenue-generating SaaS product development.

Full-stack contributor with hands-on experience building AI-powered products and community engagement platforms.

I worked on several AI experiments using the Vercel AI SDK, React, and the broader TypeScript ecosystem. One project focused on training a model to recognize a user’s tone of voice on social media, then help them generate high-performing tweets while preserving their own personal writing style.

I also experimented with LlamaIndex and early retrieval-based systems to connect external data sources to AI interfaces, before MCP became widely adopted. The goal was to let users interact with structured and unstructured data through a conversational chat experience.

Alongside this AI work, I contributed to Zealy.io across both frontend and backend. Zealy is a platform that helps companies and communities drive engagement by creating quests, events, and reward-based participation systems.

I worked on several product features, including a time-based quest and feed experience, where users had to complete a set of tasks within a limited timeframe. Community members could then vote for their favorite submissions, with winners earning rewards such as gifts, crypto, or community points.

Frontend engineer responsible for building and scaling high-traffic marketing websites using Gatsby, Astro, and React.

I worked on the company’s marketing websites, building performant, SEO-friendly static experiences on top of Gatsby, Astro, and the React ecosystem.

The platform generated around 15,000 static pages, designed to support large-scale content distribution, search visibility, and fast page loading across a wide range of markets and audiences.

These websites reached approximately 2 billion people per year, making performance, reliability, accessibility, and maintainability critical parts of the work.