Despite an economic slowdown, U.S. consumers spent record amounts during Black Friday and Cyber Monday, with $9.12 billion and $11.3 billion spent online, respectively. The success of these shopping days underscores the importance of robust IT infrastructure for eCommerce and retail businesses to handle the surge in traffic and demand. Nylas, a company that supports retailers during these peak times, emphasizes the need for scalability and reliability in IT systems, employing a highly scalable and efficient technology stack that includes customized systems to combat potential infrastructure strains. During the latest Black Friday and Cyber Monday, Nylas experienced significant increases in customer accounts and requests per second without any downtime, thanks to their preparations. Additionally, the use of first-party data, such as insights from mobile sales traffic and email data, enables businesses to tailor customer experiences and improve personalization. The case in point is a leading eCommerce platform that successfully processed and leveraged data from over 37 million orders, gaining valuable insights into customer behavior and enhancing their service offerings. As businesses prepare for future high-traffic events, ensuring their IT infrastructure can manage the demands of millions of transactions is crucial in delivering personalized and seamless shopping experiences.