Yeah, I actually took part in setting it up with them. It was CloudStack. API layer in front of hypervisors.
Such is the cloud software... :)
Cloud, besides APIs, i.e managing hardware at scale was not really what they did.
They did roll 1000s of vms per week through it in ci/cd flows though.
As such it did what it was supposed to do - docker/containers was not a thing at that point in time, and I remember thinking it was pretty awesome.
To many nifty engineers, with long fingers, for their own good though. You need to be strict with automations if you want to keep something like that running reliably over time.