Need Forex Program Software for Clients

I need a an experienced C programmer. My friend said C level programming is the most intense and secure. What I am looking for is, a basic piece of software that can send signals from my end into the software. For example if I asked them to BUY EUR/USD at 1.1234, it should show on the software on their side. In addition, there must be a feature where they can see the trades on our MT4 platform on their side. There should also be a popup/sound like MSN MESSENGER" in the system tray every time activity has been made. It must be connected to my Joomla database because I have paid subscribers. When a subscriber has subscribes, the client should automatically be allowed to use the software. When his membership has expired on the joomla site, the software should automatically blocked. The software should be compatible with Windows, Mac, Android, Iphone. There is more to be said, but I will explain better if I can explain better in detail. This written software needs to be very secure... clients who use it should not be allowed multiple logins. The software also should not be decompiled easily so they bypass the restrictions on the software. This software needs to be the highest secure possible because this is a paid service I am offering to my clients. PM for details