Drupal 7 module for "Contacts functionality"

Here is the list of functionality which I will develop in the module 1- Create Entity for contact via entity API module 2- Add permission for user roles 3- Provide Add/Edit/Delete/View functionality for created entity 3- Provide upload functionality while using this user will able to import contacts from remote URL via batch process. 4- Create web services for Add/Edit/Delete/View in rest JSON format. I will extend services module api and will create extra resource for our created entity. Misc details: We need a Drupal 7 module developed that can do the following: Contact management (like contancts on a mobile phone) add contact edit contact delete contact upload contact view contacts These operations should be supported both through user interface (Drupal php pages) & through custom module REST API. (You would need API endpoints/urls to handle these operations) This is a trial project, if we are happy with the results we will give you a part-time to full-time opportunity to work on our project. Would appreciate you give us an estimate of how much ($) would cost for you to build the module described above. We want a good UI look & feel, it should look appealing and easy for signed in user to either add through UI pages or for a different application to call these endpoints through RESTful endpoints.