Standard recruiting in an attempt to fill contract slots on government agency contract slots. Interviewing was non-technical. PSS is simply overhead on hourly-billable government contracts. Frankly, there are many companies doing the exact same thing better than PSS.
I declined their job offer because of their mandatory and horrid non-compete contract where the employee gets nothing in return for giving up many rights. Read it. You give up the right to perform ANY similar work for ANY employer in radii of PSS office and customer workplace that covers the entire metro DC area, even if you're terminated. PSS appealed lawsuits based on this contract all the way to the VA Supreme Court. I believe that for any given contract position you can find another contractor or prime contractor that would better for you as an employee.