Dear Amirul Ahmad,
Thanks for your posting this job that is exactly within my scope of expertise.
I am a full-time certified iPhone/Android app developer, and I have rich experiences with JSON web api and RESTful web apis, Push Notification.
Well, I can write the webapis using codeignitor framework.
And integrating Facebook, location tracking/searching, posting new entry are not problem.
Besides, I am very familiar with third party api, as such as facebook, twitter, linkedin Api, Parse.com.
And I can make gorgeous ui with psd files, exactly same.
During 4+ years, I have developed many apps. Please kindly visit some of my works here:
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I am ready to start now, and I can finish this job perfectly.
Waiting for your kind and positive reply.
Thanks & Regards,
Feng Liu