Do you start with the frontend, build it out completely without functionality, then adding the functionality (backend, backend calls etc.) or how do you tackle the first development steps?
I haven't built a SaaS in general, but I've created a few apps (Android + Web Apps). I always start with the design mockups. Then I decide which framework I'm gonna use for front- & backend. Then I decided the basic database structure. Then I built the frontend with mockup data to see if the structure was actually good. Then I built the backend.