Bespoke survey creation utilising jQuery/jQuery UI

We need a confident developer to produce and expand on an existing survey system. The current system exists utilising PHP and smaller Javascript libraries. A new system has been built under PHP and jQuery/jQuery UI libraries to build a more aesthetically pleasing design. The developer is to work on creating a survey creation/editable page whereby a user can create or edit a survey. The content of the page is required to Add, Edit and Delete content from Categories, Sub-Categories and Questions. The content will also need to be functional, yet aesthetically pleasing to accommodate the needs of the client. In summary, we need a developer that can work with the serialize() function in jQuery/UI to either produce a new system, or work on a previously created nested list system. The outcome of the project is to create a survey system whereby a user can Add/Edit/Delete, Categories, Questions and Sub-Categories. The developer must have a key understanding of the Jquery libraries including the .serialize(), .sortable() and .draggable()/droppable() functions. Any further clarification can be provided by the existing developer and further screenshots of the existing progress can be provided on request, example can be seen in the screenshot.