hi, I am a computer engineer, I have a good experience on microsoft technologies specially with asp.net mvc, I realized a lot of complex project, and I also work on the performance of the application, using some libraries and techniques that did the trick.
I have already made a audiovisual messaging application with the WPF technology and microsoft silverlight
I can make this solution with silverlight Microsoft technologies, to gain security, and performance at the same time. And you can integrate it with any application coded with php or others languages.
I have a solution with the microsoft technology, you can integrate with an application in php
And i can be very helpful to you and I hope will not disappoint you for this.
If u r interested just send me a message thank you and good luck.