Weight Watchers implemented a high-speed, global personalization effort to modernize their marketing technology in two months. They organized cross-functional teams to test segmentation and dynamic content strategies across multiple markets in parallel. This agile, multi-market development approach allowed them to generate 12 million unique customer journeys, launch in 11 countries, deploy the new system in 8 weeks, and see a 15% impact across key performance indicators. Moving forward, Weight Watchers aims to expand omni-channel capabilities and further integrate personalization into their apps and products.