WordPress plugin development for a form builder and file management system.
The idea here is that forms can be created by the user, and then data entered into the form fields for file storage.
The tasks involved are...
1. To create custom posts types for the different forms and files
2. To create the form builder attached to each custom post type
3. To implement a payment gateway system to activate accounts
Good php skills are essential, some Jquery skills would also be good, although not essential, and any prior knowledge of WordPress hooks and filters would be a good time saver.