The Jamstack, a modern architecture for faster and more efficient websites, was used by Harper Reed, the former CTO of Obama for America, to build a scalable and fast fundraising platform. The switch from server-side rendering to client-side rendering significantly improved speed and usability, allowing supporters to donate quickly and efficiently. Harper's experience with the Jamstack highlights its benefits in terms of speed, simplicity, and accessibility, making it an attractive option for developers looking to improve user experience and productivity.