API for social and dating network

I want a programmer to build an API so that other programmers can use it to build applications and put them in my site's app directory.
I will give the DB structure and you will have to build an API that will use the data from my DB to retrieve user data, when requested.
In other words and API like those of facebook, myspace, orkut etc
A REST API that will be used by any kind of web programming language to retrieve user data.

The process will be this one:
1.The programmer builds an application and submits it in the app directory of my site. He gets an API secret key that will use to make the requests.
2.The user accepts to share his public profile data and email address and adds an application.
3.When he access the application, in the canvas page, he sees the page that the programmer submitted as canvas url, during the application submission, as shown in the first step.
4.The application can retrieve the COOKIE email and make a request for user data using that email and the API secret key


------ Here I start to analyse what I ask you to build for my site -------
5.When the application makes the request you have to have built the files needed to get the request, check if the user with that email address has added the application with that API secret key and if yes, it returns the user data... If not, it returns a failure message.

The requets are of 2 types:
a.Get user data (name, surname, birth, sex, sex preferences etc)
b.Submit notification

The first type of request has been analysed in the step 5

The submit notification request, instead, will have the following process:
The application makes the request using the email of the user, the API secret key and the message of the notification.
You have to authenticate if the user has added the application as of step 5 above and if the user permits notifications of that application the message gets submited in the DB. If not, a failure message has to be returned to the application...

The API has to use an XML output so that it can be used by any programming language. Though, you have to build 1 file for 4 programming languages (PHP, RUBY, ASP, FLASH) so that developers can include the appropriate file in their applications and get the variables ready to use in their scripts. This way we make the programmer's life VERY VERY EASY...
If the programmer, though, wants to use another language or doesn't want to use those pre-built files, he can use the API commands to make the requests as he likes...

----- The end -----

I hope I was clear and analysed everything in depth.

Please submit your proposal and if they are in logical levels I will contact you !!!

The project is really very easy for someone with good knowledge of APIs
If you think you can do it, i will be glad to hear from you!

p.s. I use PHP and mySQL for my site. The server is (Linux) dedicated and I can install every component needed.