
Understory Unfiltered: Marcel Santilli on Building an AI-Native Agency
Marcel Santilli spent years as a CMO before launching GrowthX, an AI-native agency that codifies marketing workflows like software code. Here's what he learned.

Allbound coordination routes Clay signals into outbound to kill CAC.

Marcel Santilli spent years as a CMO before launching GrowthX, an AI-native agency that codifies marketing workflows like software code. Here's what he learned.

Lindy Drope manages 300 AI agents and doesn't know her HubSpot password. Learn how SaaS teams can eliminate sales admin entirely through agentic workflows.

The highest-converting outbound CTAs reduce friction to a single action. For SaaS with $20K+ ACVs, avoid generic "let's chat" language. Specific asks work better: "15 minutes to show how [outcome]" or "quick question about [specific pain point]." Match urgency to where prospects sit in their evaluation process.

Catch up on our Understory Unfiltered episode where Harris Kenny reveals how OutboundSync recovered a $400,000 Porsche deal and why agency partnerships beat direct sales for GTM.

Catch up on our Understory Unfiltered episode where Robert Yuen shares how he went from sleeping on an office air mattress to building a 100-person SaaS company serving architects.

Discover the GTM tech stack for a coordination hub and automated workflows that deliver higher reply rates.

Best practices to optimize CAC, leverage pipeline attribution, and grow revenue for B2B SaaS growth.

Discover how poor CRM management can hurt outbound campaigns while clean data drives revenue growth.

Stop juggling multiple dashboards. Learn how HubSpot Enterprise eliminates hours monthly of manual reporting while connecting paid media to revenue.

SmartLead founder Vaibhav Namburi shares how 11 failed businesses, WhatsApp community presence, and platform-as-a-service thinking built an email infrastructure managing 5-7 million mailboxes and 110M+ daily warmup emails.

Catch up on our Understory Unfiltered episode where Nick Velkovski shares how he bootstrapped HeyReach to $7M+ ARR from Macedonia after Y Combinator rejected him twice.

Catch up on our Understory Unfiltered episode where Eli Rubel shares how he scaled MatterMade to $4.2M EBITDA, why VCs are not doing good in the AI era, and how he vibe-coded a SaaS product in seven days.

Hyperbound co-founders Sai and Atul share how 25,000 hand-personalized LinkedIn messages led to accidentally building AI sales roleplay, why reinforcement learning discovers behaviors like "negging mid-market prospects," and their prediction that cold outbound will die within five years.

Compare tools and learn what you need to know to make a decision.

Compare top attribution platforms for B2B SaaS. Expert review of features, pricing & implementation for high-ACV deals.