Last Updated: 6 May 2025
StackOne, an AI-driven integration platform designed to streamline SaaS and enterprise AI agent connectivity, has successfully raised $20 million in its Series A funding round. Leading the investment is GV (Google Ventures), alongside Workday Ventures, XTX Ventures, existing backers Episode 1 and Playfair, and angel investors from OpenAI, DeepMind, Microsoft, and MuleSoft. This latest funding round brings StackOne's total raised to $24 million.
The investment underscores StackOne’s promising potential in advancing its proprietary large language model (LLM), driving extensive research and development, and expanding integrations with major enterprise platforms.
Integration capability is critical in the competitive SaaS market. A vast majority (83%) of B2B buyers prioritize seamless integrations, yet 71% of SaaS companies still take weeks to launch basic integrations, causing significant delays and lost business opportunities.
StackOne's founders, Romain Sestier (CEO) and Guillaume Lebedel (CTO), developed their approach after experiencing firsthand the integration struggles in building billion-dollar SaaS products for Google, Oracle, and Yieldify.
"For over a decade, Guillaume and I have felt the acute pain of integrations. We’d see teams burn months rebuilding or refusing requests and nothing on the market eased this pain."
Romain Sestier, co-founder and CEO, StackOne
StackOne plans to leverage the new capital to refine its unique LLM for integrations, expand its research efforts, and increase both the number and depth of platform integrations. This strategic initiative aims to establish StackOne as the primary solution for rapid, secure, and efficient enterprise integrations.
Already recognized by leading organizations such as Drata, Attensi, and Localyze, StackOne has facilitated over 1 billion API calls, proving its capability to handle enterprise-scale operations globally.
Founded by Sestier and Lebedel, StackOne addresses the integration challenge with its proprietary AI-driven agent and real-time platform. Developers typically spend extensive time dealing with complex enterprise APIs; StackOne automates this cumbersome process, providing immediate access to over 3,000 actions across 200+ connectors. This enables product teams to focus on core functionalities without compromising security or reliability.
"Integrations are now table stakes for winning and keeping customers in B2B SaaS. Emerging standards like the Model Context Protocol (MCP) alone don't meet enterprise needs. StackOne solves this comprehensively, marking a new generation of integration platforms."
Guillaume Lebedel, co-founder and CTO, StackOne
StackOne's investors represent some of the leading voices in tech and AI. Luna Schmid, Partner at GV, remarked, "What impressed us most about StackOne is its ambition and clarity. Romain and Guillaume aren’t building just another SaaS integration platform. They’re creating infrastructure that modern software and the entire AI agent ecosystem can rely on."
Barbry McGann from Workday Ventures highlighted StackOne's swift and robust integration capabilities, noting, "In a space where speed and scale often trade off with reliability, compliance, and functionality, StackOne delivers all of the above in a universal layer—without compromise."
