Not sure of the Global guys... VistaJet...
The 300/350 guys pay starts around FO - 75k, Cap -123K
Upgrade is decently quick. About 1 year depending on backlog. 17on-13 off, I think. Home based.
Extra day pay is 400 FO 600 PIC.
I don't work there, just know some people who do.
Jet Aviation is generally account dependent.