I used to be a contractor for my current company (employee now) and almost all contractor positions were through recruiting firms. And even if there were interviews it was after the potential contractor was referred to the company. For applying on the website, that was pretty much a farce for at least my department. The managers already knew who they wanted from the contractors that were there or if they were referred by someone else. They had interviews for the open positions but pretty sure it was for show. When they finally talked me into coming internal they told me exactly when to apply on the website and pretty much fast tracked the entire process from that point.
