Write an application for Android

We seek a professional to build an Android application to send instant messages. The freelancer must follow these steps: 1. Creation of the graphic design of the app (whatsapp graphic style, but with the colors of blue and purple shades); 2. Create backend (server side) and forntend (user side APP); 3. The application must allow sending instant messages with ability to attach photos, small videos, audio files and audio messages recorded at the time and file (pdf, rar, zip, ....); 4. The application must provide the geolocation with the ability to see where the other users in your address book; 5. Each user must be able to invite all contacts (the contacts will be automatically recognized from the app) and the app must riconsocere all contacts who are already using the application. 6. The logo will be provided by me ... 7. The application must be in English and Italian. In the server side (backend) will not be stored messages of any user, I can only keep all the telephone numbers of users who are using the app and possibly download reports in CSV of all contacts and freeze any contacts marked as spam.