Profile banner
Romain Sestier

Romain Sestier

Co-founder & CEO at StackOne, building the universal integration layer

London, England, United Kingdom
Joined July 2026

Network

8K connections

Summary

Romain Sestier is a two-time co-founder and product leader with extensive experience in building and scaling SaaS products. He co-founded StackOne, an AI-powered integration platform, and previously co-founded Upper.ai, an AI data analyst tool. His entrepreneurial drive is evident in his commitment to solving complex integration challenges faced by SaaS companies and leveraging AI for innovative solutions. unite+1
With a strong background in product management, Romain Sestier has a proven track record of developing successful products, including scaling a product at Google from $0 to a $1 billion valuation. His leadership experience extends to managing global product and services teams, where he focused on aligning product roadmaps with revenue outcomes and improving customer success metrics. unite+1
Romain Sestier possesses deep expertise in the SaaS integration space, having experienced the challenges firsthand at companies like Maxymiser, ContentSquare, Yieldify, and Google. This extensive background informs his work at StackOne, which focuses on providing secure, reliable, and real-time integrations, particularly addressing the needs of AI agents and enterprise B2B SaaS companies. unite+1
He is a strong advocate for data privacy and security in integrations, a core principle reflected in StackOne's architecture which ensures no data is stored at rest or in transit. Romain also emphasizes addressing the significant security and compliance concerns that hinder the mass enterprise adoption of AI agents by implementing features like least-privilege OAuth scopes and full audit trails. unite+1

Work

Education

Notes

EWErick Watsonsaid they've seen
RSRomain Sestier
build and lead a company as founder or cofounder in a way that truly stands out.

Sep 5, 2025