Most if not all the positions posted for bid are by the US Army Corps of Engineers for Park Attendant contracts. As an independent contractor you are not directly employed by the Corps of Engineers so there is no set pay scale.
I'll be with Win 7 on both systems until either I or Win 7 reaches EOL in 2020. If Win 7 gets there first and I remember how to turn on a computer, and why I did, I'll deal with it then.
Unless Windows 10 makes some extreme improvements by then I'll probably look at other alternatives. My computer needs are pretty simple and Windows 10 in it's present state doesn't offer me anything I need.