Front end first vs back end first - v0 or bubble?

Hey All, I used v0 to build my front end for a CRM I am creating. The MVP is about 70% done. I know I have to then create the backend and there seems to be a lot of tools to walk me along that path but I am curious what your thoughts are on creating the Front, then creating the back VS using something like Bubble that does both. As you can tell I have quite limited experience in this so any suggestions would be appreciated.