London-based StackOne has raised $20 million in a Series A funding round led by GV (Google Ventures), with participation from Workday Ventures, XTX Ventures, Episode 1, Playfair, and angel investors from OpenAI, DeepMind, Microsoft, and MuleSoft. This latest investment brings StackOne’s total funding to $24 million.
Founded by Romain Sestier and Guillaume Lebedel, StackOne aims to streamline the integration process between SaaS platforms and AI agents. The company’s proprietary AI agent and real-time engine are designed to connect complex enterprise APIs more efficiently, reducing integration times from weeks to days.
“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. So we, alongside a super talented and passionate team, built it ourselves. StackOne doesn’t just reinvent how integration platforms can and should be built – with depth, accuracy and security by default – but we believe AI agents are the missing piece in finally delivering enterprise-grade integrations at scale. It’s the platform we’d always dreamed of, built for the AI future of SaaS, and it’s a vision shared by the whole team. This shared experience has shaped a culture of innovation, collaboration and deep care for the product we’re building and it shows,” said Sestier.
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StackOne’s platform offers over 3,000 actions across more than 200 connectors, covering areas such as HR, CRM, ticketing, messaging, and identity and access management. The company reports having surpassed one billion API calls and counts clients like Drata, Attensi, and Localyze among its users.
The new funding will be used to advance StackOne’s tool-calling language model, invest in research and development, and expand the platform’s integrations and actions.
Luna Schmid, Partner at GV, commented, “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. The depth of secure integrations, the pace of delivery, and the team’s foresight into AI’s future uniquely position StackOne to redefine this category.”
As the demand for seamless integrations between SaaS applications and AI agents grows, StackOne’s approach positions it as a significant player in the $17.5 billion integration market.
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