I can totally develop a Zynga Poker like game! I'll choose Unreal Engine 4 for this project as it's my natural habitat at this after 3 years of experience with the engine.
As long as I you provide the assets needed for it (like 2D images and sounds) it can be done in 7 days, no problem.
I have experience developing mobile games and networked games, so this game can be desktop, mobile, and done for online matches, local matches (LAN), or solo against AI (please specify how you want it done!).
Also, I can optimize well for mobile.
Project can be deployed for Android and iOS and have full store capabilities and in game purchases if that's the plan.