Grüß, I thought I'd put a bid in a soon as I could before you became inundated.
I'm a 'mobile' HTML5/JQeury Game Developer by trade, but I spend a lot of my time 'copying' native functionality for the web... Lots of widgets like; Loyalty Points Systems, quote engines... Things like that.
It's difficult to put an accurate quote in for your project at present, as you haven't provided a link to your current native application, so my bid-price could move up or down, depending on the full scope of your brief.
I have 6 years worth of mobile web sites / web-apps that I could show you, but it would be more efficient if I could show you something that's pertinent to your own requirements. Please feel free to send me a little more information about your app, so I can complete a more relevant proposal.
All the best
Mark