Casino game - slot machine - mobile application - multiple systems

We are a company who develops slot machine software in Europe and would like to try a new approach. We need a programmer who can use OUR graphics to make us a mobile slot application. As we would like this project to be ready asap, we would like to find programmers who wave done a similar project before and have references they can show us. The slot application should have (for example you can look at the game Slot Machine on Android): - Multiple games selection (first is open for all other you will had to have a turnover to enable them). - You get daily coins for logging in. - You can buy coins for real money - via play store and apple store. - The games should be able to use our 800x600 graphics of the games. - The system has to be Google Play and Apple Store approved. - There should be a administration interface for adding more games (in the start phase only the graphics would change), - the programming has to be made in a programming language that's exportable to multiple systems - like Xamarin, - the programming has to be transparent, commented and with a description of all files to replicate it, - all source codes have to be provided. Games: - the movement of the reels has to be "realistic", - all winnings have to be displayed correctly, - if possible you can use our mathematics to display the reels (we will provide the reel positions), - a credit buy option should be available within the game and the menu. Questions are welcome.