Managed 25+ countries across EMEA, USA, Canada, Australia, New Zealand, and Japan, directing $150M+ in annual ad spend across Google Ads, Microsoft Ads, Meta, TikTok, Snapchat, and Pinterest while overseeing comprehensive asset development operations. Designed and executed rigorous A/B testing frameworks including incrementality testing, CLS validation, FeedX experiments, multicell analysis, and GeoX testing, complemented by native platform tests and pre/post evaluations. Developed sophisticated attribution models and Marketing Mix Models using Google Meridian to optimize budget allocation across channels. Built and maintained real-time performance dashboards in Tableau and Looker while conducting deep data analysis using SQL to extract actionable insights from complex datasets. Achieved $350M GMV with peak performance of 400% ROAS, demonstrating consistent ability to scale global campaigns profitably across diverse markets and platforms.