StackOne is a technology company.
StackOne provides a universal integration layer for modern products, enabling seamless real-time integrations with best-in-class security and privacy.
StackOne has raised $24.0M across 2 funding rounds.
StackOne has raised $24.0M in total across 2 funding rounds.
StackOne is a London-based technology company building an AI-powered, universal integration layer for modern SaaS products and AI agents, specializing in real-time, privacy-centric integrations for enterprise systems like HRIS, ATS, LMS, and CRM (e.g., Workday, SAP, Oracle).[1][2][3][4] It serves HR technology companies, compliance platforms like Drata, and AI agent builders like Kinfolk by solving the pain of building and maintaining dozens of complex, secure integrations—enabling seamless workflows without storing personal data.[2][3][4] With clients including Localyze, Reachdesk, and Phrasee, StackOne has gained early traction, highlighted by its selection for UNLEASH America 2024 and a Series A led by GV, demonstrating strong growth momentum in the AI-driven integration space.[2][3]
Founded in March 2023 by Romain Sestier and Guillaume Lebedel—both with deep technical backgrounds from Google, Oracle, Yieldify, JP Morgan, Coinbase, and Microsoft—StackOne emerged from the founders' firsthand experience with the cumbersome, time-consuming, and costly challenges of enterprise-grade integrations.[1][3] The idea crystallized as they recognized the intensifying need for reliable, secure interfaces, especially with AI agents demanding real-time actions in enterprise tools; they started by tackling tough pain points, like Drata's user access reviews requiring deeper integrations than competitors offered.[3] Early traction came swiftly through effusive customer feedback and partnerships, culminating in GV's Series A investment to scale their vision of a "next-generation integration layer."[3]
StackOne rides the explosive growth of AI agents requiring secure, scalable integrations into enterprise systems, where emerging standards fall short on security and depth—timing perfectly with AI's demand for real-time, bidirectional actions in HR, productivity, and compliance tools.[3][4] Market forces like rising cyber threats, procurement hurdles for data-storing solutions, and the fragmentation of SaaS ecosystems favor its no-storage, proxy-based approach, enabling faster HR workflows and agent adoption.[2] By creating a "universal interface," StackOne influences the ecosystem as the go-to layer for AI builders, reducing integration barriers and unlocking agent potential worldwide, much like how Stripe simplified payments.[3][4]
StackOne is poised to dominate as the de facto integration layer for AI agents and SaaS, with GV's backing fueling expansion into more enterprise systems and agent frameworks. Trends like multi-agent orchestration, stricter privacy regs (e.g., evolving GDPR), and agentic AI proliferation will amplify its edge, potentially evolving it into an infrastructure primitive powering the next wave of enterprise automation. As AI agents move from hype to core operations, StackOne's real-time, secure foundation positions it to capture massive value—watch for deeper AI-native features and broader category coverage to cement its lead.
StackOne has raised $24.0M in total across 2 funding rounds.
StackOne's investors include Episode 1 Ventures, Pareto Holdings, Playfair Capital, Streamlined Ventures, Workday Ventures, XFactor Ventures, Charlie Songhurst, Will Martin, Cherry Ventures, iNovia Capital, Abe Burns, Michael Levinthal.
StackOne has raised $24.0M across 2 funding rounds. Most recently, it raised $20.0M Series A in May 2025.
| Date | Round | Lead Investors | Other Investors |
|---|---|---|---|
| May 1, 2025 | $20.0M Series A | Episode 1 Ventures, Pareto Holdings, Playfair Capital, Streamlined Ventures, Workday Ventures, XFactor Ventures, Charlie Songhurst, Will Martin | |
| Mar 1, 2024 | $4.0M Seed | Cherry Ventures, Episode 1 Ventures, iNovia Capital, Pareto Holdings, Playfair Capital, Workday Ventures, Abe Burns, Charlie Songhurst, Michael Levinthal, Paul Forster, Will Martin |