I don't know what they're using to build this app, but it seems to have incessant, random bugs in state management. The newest one is that I have to tap on the guest sign in option, go to the menu, and then tap the sign in option there to sign in successfully. Otherwise it shows an error message like it's trying to parse HTML as JSON. Y'all need some QA. That being said, the pizza builder interface works pretty well now.