I was interviewed in 2002, one of the first when they started. Was about half an hour and absolutely standard stuff. I was type rated, so a couple of type tech, a couple of general tech and the usual "What would you do if the Captain reported the worst for wear for drink?''. May have changed since then, but GSS is a fairly traditional company.
Was offered the job, but didn't take it. Not enough peanuts for this monkey!