StackOne
Category: AI Agents
StackOne is the integration infrastructure for AI agents, connecting, optimizing, and securing AI agents' external interactions to fully automate workflows. StackOne was founded in 2023. The company is led by Romain Sestier. Based in London, UK. Team size: N/A. Total funding raised: $24 million. Latest round: $20 million Series A. Key investors include GV (Google Ventures), Workday Ventures, XTX Ventures, Episode 1 Ventures, Playfair Capital, Portfolio Ventures, Founders of GitHub, Onfido, and Hofy.
- Founded
- 2023
- Headquarters
- London, UK
- Team size
- N/A
- Total funding
- $24 million
Value proposition
Simplifies and enhances SaaS and AI integrations with a flexible platform, advanced data privacy features, and real-time data access.
Products and solutions
Unified APIs (HRIS, ATS, CRM, ESPs, etc.), AI Agent Actions, Embedded authentication hub
Unique value
Reinventing SaaS and AI agent integrations with a privacy-first approach and real-time data access, combining both Unified APIs and AI Agent Actions.
Target customer
SaaS companies and businesses leveraging SaaS and AI integrations.
Industries served
HR Tech, Recruitment Tech, CRM, Customer Support Platforms, Other sectors relying on SaaS and AI technologies
Technology advantage
AI-powered platform with state-of-the-art tool-calling LLM, real-time data access within seconds, secure zero-trust framework, and no storage of personal data, enabling rapid deployment of integrations.
How they differentiate
Differentiates through its focus on AI agent integrations, real-time data access, privacy-first/zero-trust security, and a unique combination of Unified APIs with AI Agent Actions, all designed for ease-of-use for SaaS vendors.
Main competitors
Paragon, Pipedream, Cloud Elements, Zapier, MuleSoft
Key partnerships
BambooHR, HubSpot, Lever, Oracle, HiBob
Notable customers
Screenloop
Major milestones
Raised $3.6 million in Seed funding. Raised $20 million in Series A funding led by GV (Google Ventures). Rapidly expanding integration offerings and customer base.
Growth metrics
Rapid ARR growth since launch, with revenue more than doubling in a few weeks prior to the seed funding announcement.
Market positioning
Next-generation, AI-powered platform for enterprise AI agents and SaaS integrations; a cutting-edge innovator in AI-driven SaaS integrations with a strong foothold in Europe and global expansion plans.
Geographic focus
Primarily United Kingdom and Europe, with plans to expand globally.
Patents and IP
Information not publicly available
About Romain Sestier
Romain Sestier is the Co-founder and CEO of StackOne. He spent 3.5 years at Google building a product that scaled from $0 to $1 billion, and served as VP of Product at Yieldify. He also worked at Maxymiser (acquired by Oracle), where he met StackOne co-founder Guillaume Lebedel. Prior to StackOne, he co-founded Upper.ai, an AI-powered data analyst for marketers, with Lebedel. He holds a degree in Business Management/Marketing from Royal Holloway, University of London (2011–2014), graduating with First Class Honours in the top 3% of his class.
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Official website: https://www.stackone.com/