Marcel Santilli

Marcel Santilli is the CEO and Co-Founder of GrowthX AI, a San Francisco-based 'service-as-software' company that combines expert-led strategy with AI workflows to drive organic growth for B2B companies. Born and raised in São Paulo, Brazil, Santilli spent 15+ years as a CMO and marketing executive at companies including IBM, HP/HPE, HashiCorp, Scale AI, and Deepgram, helping scale a combined $1B+ in ARR across three unicorns. After spending over 1,000 hours encoding marketing workflows into AI at Deepgram, he co-founded GrowthX AI in September 2024 with CTO Daniel Lopes. The company reached $7M+ ARR profitably in under 12 months — using only its own methodology, zero paid ads — before raising a $12M Series A led by Madrona Ventures in May 2025.