As a contractor you do not have a fixed base and as such you're likely to be on the road all the time on a 5 on 5 off roster, for example 5 days Stansted followed by 5 days in Hahn followed by 5 days in Skavsta followed by 5 days in Prestwick, etc.
You can pick a preference base and they will try to get you to operate from there as often as possible but you will be rostered to wherever they need you.
On contract, you are contracted out to Ryanair by Storm or Brookfield and as such you are not a Ryanair employee. However, if contractors wish to apply for permanent jobs, they'll have preference.
Hope this helps...