Hello,
I have read your job carefully and your project caught my eyes particularly based on my skillset.
I'm guru of mobile app development and I have extensive experience using several framework such as Web service, GPS, Google API, Bluetooth, Facebook/Twitter SDK, Urban Airship, Push Notification and more.
I also have much experiences in backend development with PHP, MySQL, RESTful API, JSON/XML.
If you want, I will show you my successful apps that I have developed before.
I hope this project would be the first step in long term partnership with you.
I feel confident my execution of this order will be to your complete satisfaction.
I await your favorable reply with interest.
Thank you.