Team(Devs) Server for Development?

Is there a developer server where teams can work on and share files for the UE4 through a WAN? Or is this just a matter of setting up a file server?

Are you looking for source control?

UE currently supports Perforce (P4) and Subversion (SVN).

Here is the documentation on that:

Awesome! Thank you Bajee. Thank you for the links.