StackOne, a next-gen AI-based platform advancing the future of enterprise AI agents and SaaS integrations, announced it raised $20 million in a Series A round led by GV (Google Ventures). Workday Ventures, XTX Ventures, existing investors Episode 1 and Playfair, and angels from OpenAI, Deepmind, Microsoft, and Mulesoft also participated.
What the funding will be used for: This funding round, which brings StackOne’s total raised to $24 million, will be used to continue building StackOne’s state-of-the-art tool-calling LLM, invest in R&D, and further expand the number of integrations and depth of actions available in the StackOne platform.
Value proposition: Software platforms depend on how well they integrate with other tools, whether an AI recruitment agent sourcing candidates in Workday, a SaaS security platform raising a ticket on ServiceNow, or an AI HR agent automating onboarding. Integrations are so important that they are now a top priority for B2B buyers. However, SaaS firms still take three weeks or more to launch a single connection, meaning engineering teams are losing valuable time and resources, and SaaS firms are losing out on contracts.
StackOne’s founders – Romain Sestier (CEO) and Guillaume Lebedel (CTO) saw this first-hand during 10+ years of working together at multiple companies, building billion-dollar SaaS products for Google, Oracle, and Yieldify. And with the rise of AI agents demanding a new integration interface, this challenge is only getting harder.
While emerging standards show where the market is heading, they often lack the security, depth, and scalability needed for real enterprise use. StackOne addresses all of this by reinventing the way integrations are built while combining a proprietary AI agent and real-time engine to give teams the speed, coverage, and reliability to finally connect SaaS and AI agents to the enterprise tech stack.
Developers normally spend weeks combing through messy enterprise APIs, writing custom logic to get a single integration to work. And StackOne’s proprietary AI agent takes on this heavy lifting. It also automatically builds use-cases on top of even the most complex APIs, connecting AI and SaaS tools to their customers’ entire tech stack in a fraction of the time, and with higher accuracy than even the most precise, leading LLMs.
With the platform, product teams instantly have access to 3,000+ actions on 200+ connectors, from HR to CRM, ticketing, messaging, and IAM. StackOne’s proprietary AI-first and enterprise-ready approach means integrations are secure and up-to-date by default, freeing developers to focus on core roadmap features and scale without sacrifice.
KEY QUOTES:
“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.”
Romain Sestier, co-founder and CEO, StackOne
“Integrations are now table stakes for winning and keeping customers in B2B SaaS, especially for the ever-growing swathe of AI agents. You only need to look at the rise of standards like Model Context Protocol (MCP) to see the demand, but these protocols just aren’t fit for enterprise use by themselves – they’re a small piece of the puzzle. They lack security, accuracy and scale. They don’t work with multi-tenant systems, they’re too restrictive for the complex needs of big business, and they don’t go deep enough. StackOne solves all of this in a single layer; one that marks the birth of a new generation of integrations platform for an AI-first world.”
Guillaume Lebedel, co-founder and CTO, StackOne
“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.”
Luna Schmid, Partner at GV
“We’ve been impressed by how quickly and deeply StackOne integrates with complex enterprise systems – and now, with their focus on agent-to-agent interoperability, they’re unlocking even more powerful use cases for customers. 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.”
Barbry McGann, Managing Director and SVP at Workday Ventures
