Building the universal integration layer for modern products and raising a Series A from GV with Romain Sestier & Guillaume Lebedel, Co-Founders @ StackOne

In this episode of Riding Unicorns, we"re joined by Romain Sestier and Guillaume Lebedel, the co-founders of StackOne, a rapidly growing startup that’s building the universal integration layer for modern SaaS and AI products. Hot off the back of their $20M Series A led by GV, the duo joins us to share their journey, insights, and lessons from the trenches. Romain and Guillaume have known each other for over a decade, having worked together across multiple companies before launching StackOne. Their deep co-founder chemistry and clarity of vision have helped them move fast and build credibility with customers and investors alike. We dive into: 🔧 What StackOne does and why integrations are mission-critical infrastructure  🧠 How they approached finding a co-founder (and why that came before the idea)  🚀 Their path from idea to Series A, including early customer acquisition and GTM learnings  💼 Building a high-talent, low-ego team and making tough hiring decisions  💡 How to scale enterprise sales as a founder  🔥 The mindset shift required to build a venture-scale company  🧪 How they stay nimble while evolving the product and org structure  📣 Tips on empowering internal champions and structuring a sales process that scales This is a must-listen for any B2B SaaS or infrastructure founder looking to build something big, fast, and globally relevant.