AJAX-based (or similar) interactive web application

I am looking for a developer to create web based application which will contact with backend via already existing and documented API, including test server with API running. The app will have following pages: - login / create account page - main app window, with navigation tree (rollUp&rollDown by clicking + sign should be working in each branch), with drag&drop and if possible - keyboard shortcuts, - settings window 1 - simple 2-3 forms, one file upload - settings window 2 - simple 2-3 forms, one file upload Number of API functions which will be executed by app - about 25 different actions. For each action to code there is ready and documented API function to execute. Basic html's and JPGs (only visual side, without any actions) are ready, covering most of application pages. The app should works on most modern browsers including IE8 and up, it will be running on a linux server with Apache and PHP5 installed. Required big experience in php, javascript and html/css. It is neccessary to implement AJAX technology, there should be as few reloads as possible, app should have similar speed, usability & experience to localy installed windows applications. As this is Alpha version - long term cooperation is possible, if work is well done. If You have any question - feel free to post them.