Hello
I have reviewed your project description and i can certainly do this job for you.
However have a few questions:
1. Please share details about the App you are using.
2. Where exactly the data of the Apps are being saved?
3. Are there any documents which cover up the logic structure of the app, may be in a layman's language, so that i can review it to understand the logical preferences of the App.
I have developed many websites, some of which you can see in my portfolio. However in case of any specific expectation/requirements i can share the relevant work done by me in past once getting to know about it.
Please open Personal Message Board to discuss this further in detail so that i may provide you the exact quote + time frame.
Regards
Sam
OweBest