I am building a similar product for the same market and what everyone has told you on this thread is great advice. People thinking that there is a one size fits all solution to hiring methods usually go out of business (path.to work4pie etc). Big hitters entering the market validates what you are doing. We have a very specific proposition for a very specific group of people which we want to solve best. If you are really interested in this problem maybe we could talk more outside of HN.