PHP Developer Wanted (with HTML, CSS3)

I am looking to develop an HTML5, CSS3, JQuery app. Not a native mobile app. It is an interview application that interviewers use to assess candidates during the interview. Prior to the interview, an interviewer chooses a set of criteria and questions per criteria. During the interview, the interviewer rates the user on those criteria. The backend will be a web service written either in PHP or C#.NET. However, the site/app (that is, the front-end) needs to be de-coupled itself from the server-side functionality (that is, the webservice which performs any functionality, adding to db, etc.) This is because, once I go the native route in a year, I want to be able to use the same set of functions (i.e. the web service) for the functionality of the native mobile app. I want someone local who would be able to work in my co-working spot in SOHO and available to start very soon. Our office is really fun and relaxed. And, if I love working with you, I will recommend you to all my friends at the co-working spot that are working on startups and need developers. If interested, let me know how long you think it would take you to complete the project and let me know your rate/fixed price. (but, don't worry, the rate won't be the only thing I look at)