When I first started at Opendoor I only supported one of the companies they owned named OSNational. OSNational used to have its own separate IT team as they were purely Windows based while Opendoor is Mac based.

Fast forward a couple years and the singular IT Team now merged. And now there are more companies to serve!
OSNational
Opendoor
Mainstay National
Mainstay.IO

How many companies are in this company?!?
With teams merged and trained up I was now in a position where the internal IT team was almost acting as an external MSP with the responsibility level we had.