Launching a global digital platform housing over 25 years of research and more than one million reports requires infrastructure engineered for extreme scale and performance. In this session, we present a real world case study demonstrating how data driven capacity planning enabled a successful go live and delivered a significantly improved user experience worldwide. We will examine the risks of under and over provisioning critical components and share a practical methodology that moves beyond guesswork. Attendees will learn how we sized diverse content types, analyzed historical access patterns, and translated empirical data into concrete infrastructure decisions, including strategic upgrades and post launch optimization. Designed for engineers, architects, and operations professionals, this session offers actionable insights into proactive performance engineering and best practices for balancing performance, stability, and cost efficiency in high traffic system launches.