Hi Rajib
How are you?
For your Security App, can we have detail discussion as I am sure i can help you in this so want to discuss whole thing.
We are the IT company having 5+ years of experience in App and Web development, App and Web designing, backend, SEO/SMM cloud services, and enterprise solutions.
We have knowledge of Xcode IDE(Objective-C), Swift, Eclipse IDE, Android SDK, ADT Plugin, Java Programming, JSON, XML, Utility APIs, MySQL and SQL server database, super level UI design and much more.