Special Auction Website

PHP,Linux, Scalable MySQL DataBase solution for enterprise level traffic Auction software for "OUR UNIQUE AUCTION FORMAT" thats NOT like ebay or yahoo auction. We will educate the programmer on how our auction system works. The programmer can modify existing auction script such as Probid or Php auction to create the auction website, Programmer must provide the database solution that can handle enterprise level of traffic which means millions of users. The programmer is expected to make the auction website SEO ready. We want to make it quite clear this is not a traditional ebay style auction. Diverse PHP programmers only should reply.