Client of geolocation game

Develop the client of a fairly simple geo-location game, preferably with PhoneGap. Offers for native Android or Android+iPhone versions will also be considered. The client interface consists of four screens: - A login screen. - A Google map where game items are shown in their locations with two fields of information. The tricky part of this screen is that there can be several items in the same location but they must not hide each other. - A table with the list of items shown in the map and more fields of information. - A leaderboard of players. The client interface must support internationalization and show Google ads. The client works connected to a server using a HTTP RESTful API. The client uses a client SSL certificate to connect to the server. The API consists of just four resources: - A resource to obtain the status of the API version. Returns a JSON object with one field. - A resource to obtain the status of a player. Returns a JSON object with one level of nesting. - A resource to obtain the status of an item. Returns a JSON object with two levels of nesting. - A single resource to perform the action of the game. Returns a JSON object with four levels of nesting. The server is already developed and in the process of being deployed to allow client development and testing. A text document with more detailed specs is ready and will be shared once an offer is accepted. Nevertheless, if you need more information or details to make your estimation, don't hesitate to ask. Proven experience with similar applications will be greatly valued, show us your work.