Add new feature to an existing iOS app

Hello All, I would like to add a new feature into an existing iPhone app. This feature will be developed independetly and integrating it with the bigger app is not in the scope of the project. I had supplied two files: 1. General requirements and specifications in a nutshell - better to read it first 2. Very detailed requirements. The purpose of the feature is to "Gamify" the app – Add games related attributes (like points and virtual prizes) The Gamification feature will be added to an existing app. Integration will not be part of this project, The feature will be developed as an independent app (using a test screen to emulate user actions). This feature already exists in my android app, so I can supply existing Java code (It can be used as a "pseudo code" or can be translated partially by j2objc). I require 4 Milestones (specified inside the documents). Please give me time and budget estimations for each one of the milestones. Developer requirements • Proven experience in developing iOS apps • Speaks fluent English • Familiarity with software design and OO software design patterns OS versions The feature should work on iOS 5 and above , iPhone 4s and iPhone 5, retina display and non retina display and iPhone 5 display resolution You are supposed to test the app in two OS versions – iOS 5. And iOS 6.x (latest), one with iPhone 4s non-retina display and iPhone 5 resolution. You are supposed to distribute to me only a tested app which does not crash and all the requirements are held and you are supposed to make a reasonable testing before each milestone (Make sure that implementation is according to requirements)