Development of iPhone and Android Apps + Backend API

We are looking for an experience Mobile App, Mobile App API and PHP developer to develop the following iPhone and Android Apps including design and the backend API: - Create a unique APP design according to the website design and company logo. - Develop a stable and secure backend API to synchronize the website admin panel with the Apps. - Develop iPhone and Android APP with the following feature: * User login - using the same login information as on the website * If user is logged in users should be able to receive message in der App user account which are released from website admin panel * Notification sounds or vibration interval until user read message (User should be able to choose the notfication mode and interval time in App user interface) * User should be able to confirm messages from website through the App and then receive another automatically generated message with further details from website. In admin interface of App there should be the following payment options available with ON/OFF function: 1. Free - App is completely free of charge 2. Trial - APP is free for a set time frame and as soon as the timeframe is expired their will be an option to pay the subscription monthly or yearly. 3. Paid option = If this option is set as ON, there is not trial and user will be asked to pay the subscription fee monthly or yearly immediately. Payment options should be PayPal and direct banking (payment APIs available through website) If option 2 or 3 is set ON, the user should only receive messages if there is a valid subscription active. If you have any question, please contact us before you place your bid. Bid price has to be final price charged.