Co-Founder & CTO at Criteo
Co-founder of Criteo, one of the most influential performance advertising and retargeting platforms in AdTech history, with deep technical contributions to programmatic bidding systems.
Last updated Apr 18, 2026 by jonholm
Romain Lerallut is a co-founder of Criteo and served as a key technical architect behind the company's performance advertising and retargeting technology. He helped build the machine learning and bidding infrastructure that made Criteo one of the most significant performance advertising platforms globally. His technical contributions established foundational patterns for real-time bidding optimization and personalized advertising at scale.