I have seen your video and think I can create such app. I am an experienced .net developer and will provide you best quality of solution. I have some question about that job:
1) I need full requirements which you need.
e. g. a) do you just want to check numbers?
2) I will do some research on features which you required for this app and are do able or not.
Feel free to contact me for more suggestion .Happy to hear from you.
Best regards
Ravinder