You know what you want. I know how to do it.
Web services are the new way of business, and you need someone to build yours. I could be that person.
But you need some tools in order to build something. And Ruby On Rails is that tool, allowing you to have your web application online not on years or months, but weeks!
Hire me and I'll take your project as it were mine. That's the only way to make it great.