Mobile app host for all devices

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
I am looking for a developer who can build a unified host that I can have multiple mobile interfaces eg. iOS, Android, WP to connect to. This host is meant to do the following :-

1. Processing the incoming coordinates and events sent from the phone devices and insert the info from phone devices into the databases
2. Process the coordinates sent from the phone and then calculate the proximity of the location and revert the surrounding events to the phone
3. Connectivity from the host to mobile devices need to be super efficient. Originally I am thinking of JSON, please advise me if there is other better options.

I am expecting you to come back with high level proposal, timeline and your understanding. I would like to get this going ASAP. You need to show me some reference side that you have done similar job before. Please don't show me irrelevant references. Thanks.

Skills required:
Android, Geolocation, iPhone, jQuery / Prototype, XML
About the employer:
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