First I wanna say as a disclaimer I never worked for Duolingo or had an overview of how they work. I am a simple creative Duo user that wanted to study what they do within Rive in a way that I become better at what I do! For that I had to use the app a loooooot, read their blog articles and play extensively with Rives state machine to try to figure out Duolingo's dirtiest secrets. I don't know if they do things the way I did, probably not, but my goal was to be able to replicate the app a bit, learn and show what I am able to do while adding my own twist and small interactive suggestions to this iconic app.