This is a demonstration of a full-stack Scala 3 application that we write during this video tutorial.
At a MUCH greater length and in greater detail, we write a production-grade full-stack application in the Typelevel Rite of Passage course, starting from the basic ideas in this tutorial.
Option 1 - clone the repo and write your app on top of it
Option 2 - clone the repo, checkout the start tag and follow along with the tutorial - this is how you can get the maximum lessons out of the video.