Brian MacDonald
Founder & Lead Engineer.
I'm a founder and operator. I've spent 20 years building businesses across the tech industry — and the last few architecting AI operating systems that help companies scale faster than their headcount can.
I grew up in Northern California in a family deeply rooted in technology. I spent 8 years at American Express, built and exited an e-commerce business in my twenties, and ran a portfolio of operations and engineering work across dozens of companies in the years that followed. The thread has always been the same: building things that work, and building businesses around them.
Today my focus is Mavrick — an enterprise-class AI coworker I built end to end, from the infrastructure up. It runs marketing and lead generation natively in Slack, integrating with 3,200+ tools across CRM, sales, and analytics.
- The core AI operating system — single-tenant runtime, secure API ingress, job queue, persistent state, autonomous worker layer (Python, Modal, Vercel, Supabase)
- A single reasoning gateway with model tiering, prompt caching, and a hard spend-cap governor — AI costs predictable and capped
- The safety layer — human approval before the agent spends or sends, idempotency so it never double-acts, CAN-SPAM compliance enforced in code
- The content engine (ingest, score, rewrite in brand voice, produce finished video) and the lead-gen engine (discover, enrich, compliant cold email)
- A voice agent that calls new leads in under 60 seconds to qualify and book
- Shipped to production as a live, Slack-native product — free to start, SOC 2 underway
Mavrick is the proof point for everything I believe about how AI should be deployed inside a business: pointed at the money, integrated with the tools the team already uses, and engineered to last. Mavrick is the product. The work behind it is who I am.
Based in Orange County, California.
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