Standard Calculator App for iPhone and Android

This is a standard calculator app for iPhone and Android. I have a list of around 25 features to be added to it. I want the worker to design all the necessary graphics for this app and code them. All graphics should look professional. I cannot compromise unprofessional designs. Please bid accordingly. Please share me your previous related works. This may help me to choose the right designer. Note: If you think you can do the coding part well if you get all the graphics needed then let me know I will hire a designer for you to design all the graphic elements. More details will be shared to the selected bidder.