Hello,
I have studied the basic requirements of the project and have a better understanding of what needs to be done to accomplish your goals.
Relevant Skills and Experience
We have experience in Java, Android SDK, APIs, REST API, Linux, Apache, MySQL and PHP, Objective-C, Swift, Ionic, GCD, Core Data, Design Guidelines, Spatial Reasoning, Git & Github
Proposed Milestones
$500 USD - Ballpark
Do you have any reference app? So, It will give me more clarity of your requirements.