Project Infinite is one of the biggest evolutions in the Dropbox product since the shared folder, enabling users to see all of the content across their entire team on their local computer without syncing it first (and instead syncing it on demand). This talk will explore how a hack week project turned into a major company initiative, the technical decisions and trade-off in its design, and how Dropbox keeps the quality bar high as it wields deeper and deeper integrations into the filesystem across hundreds of millions of devices.