Hi,
I can make such app. I will be using Google App Engine that automatically storage needs, takes care of load distribution and trafficking, secure data transfer and functionalities above and beyond an SAP/ERP. Also, the apps made on Google App Engine are robust and can be accessed via web.
I can also use Visual Basic if required. Currently I don't have a Mac environment. However, I do have experience building iOS apps for iphone and Mac. Once I get paid, I can use the money to acquire the a MacBook, so I will be able to build an iOS app using XCode and and Objective C.
For Android app, I will be using Parse, integrated on Eclipse with Android SDK.
I do have a really good experience in Visual Basic too, if ever needed.
Release the first milestone when you see the entire app working.