In a past startup, we had at least one person apply to our regular job postings with a cover that transparently said "I know this is a full-time, long-term posting, but I really want to be a contractor for a bounded time." Since it was a great fit and they were available right away (and we urgently needed more people), we made the "hire" and ended up working together for a while. Only worked because it was quite transparent and up front in the application though.