He built a product from $0 to $1B+ at Google.

Now he’s building the integration layer for the AI-first future of SaaS. In this episode of Founders & Builders, I sit down with Romain Sestier, CEO and co-founder of StackOne — the next-gen platform unlocking 3,000+ actions across 200+ SaaS tools for AI agents and enterprise software.

We dive into:

🧠 Why integrations are now table stakes for SaaS success

⚙️ How StackOne is reinventing how AI agents interact with real enterprise tools

💥 The biggest problems with today's APIs — and how AI changes everything

💡 What Romain learned from scaling billion-dollar SaaS inside Google and Oracle

📈 How StackOne raised $20M from GV (Google Ventures), Workday Ventures, XTX, and angels from OpenAI and DeepMind

Whether you're building in SaaS, AI infra, or developer tools — this conversation is packed with insight into where software is heading next.