Dear Sir,
Thanks for your posting this job that is exactly within my scope of expertise.
I am a full-time certified iPhone/Mac app developer, and I have rich experiences with JSON web api and RESTful web apis, Push Notification.
I've developed many apps and games for iOS and MacOS.
Besides, I am very familiar with third party api, as such as facebook, twitter, linkedin Api, Parse.com.
I can make the perfect product with bug free version. In addition, I can use the git or svn for the source control as well as the bug tracking.
I am ready to start now, and I can finish this job perfectly.
Waiting for your kind and positive reply.
Thanks & Regards,
Feng Liu