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StackOne provides an integration platform that connects SaaS products with client software systems.
Founded in 2023 by Romain Sestier and Guillaume Lebedel, StackOne is a UK-based integration platform provider for SaaS companies. Its unified APIs connect products with software in categories including HR, CRM, marketing, and applicant tracking. In May 2025, StackOne raised GBP 15 million in Series A funding led by GV, with Workday Ventures, XTX Ventures, Episode 1 Ventures, and Playfair Capital participating.
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