[antoinec]

Backend: Firebase, between Firestore and Real-Time Database you get enough flexibility to quickly iterate on your db schema, Functions are also good enough to handle any kind of backend (easy to integrate with express). They have a dropin authentication UI/backend that take care of all the signin/signup/forgot password logic.

Frontend: Vue.js + Vuetify, you get a simple frontend framework that gets you started in a couple of minutes, and more than enough UI components that you'd need for a POC