About StackOne
StackOne is an AI-powered integration infrastructure platform that connects AI agents and B2B SaaS products to enterprise systems via unified APIs and AI agent tool-calling interfaces. It provides real-time, secure access to over 200 enterprise SaaS integrations — including HRIS, ATS, CRM, and LMS systems — through a single interface, enabling developers to build and ship integrations without storing personal data. Its customers include compliance and HR tech companies such as Drata, Attensi, and Localyze.
Company details
Funding
Total raised
$24M
Last stage
Series A
Investors
Founders
Romain Sestier
Co-founder and CEO of StackOne. Former Google employee where he built a $0 to $1 billion product. Also previously VP of Product at Yieldify and co-founded Upper.ai with Guillaume Lebedel.
LinkedIn
Guillaume Lebedel
Co-founder and CTO of StackOne. Previously VP of Engineering at Yieldify and Solutions Engineer at Maxymiser (acquired by Oracle). Co-founded Upper.ai with Romain Sestier.
LinkedInWhat happens next.
No applications, no recruiter spam. Just the intro.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.