Entering the workspace through a portal

[PowerRon]

Hello

we have several user groups. Each user group will be given their own workspace, where they can find the data/reports/dashboards etc. they need and where they can collaborate.
We want to make some kind of a general portal, through which every user enters our domain.
This portal is no more than a URL, that consists of several tiles. Each user group has access to its own tile, as well as some global tiles that may be entered by everybody. 
Behind every tile there will be, I think, a direct link to a workspace.

With which tooling is it easy to build and maintain such a portal consisting of tiles?
Is it possible based on authorization only to show those tiles to a user he/she has access to?

Regards
Ron

Example, pushing on a specific tile directs you to the workspace of the user group