Hi,
Although I'm new Freelancer, but,
I have developed software for over 6 years, and iPhone/iPad apps for over 3 years.
I have several full-fledged apps on the App Store, using lots of technologies including Core Data, remote synchronisation, push notifications, in-app purchases, etc.
Your project is quite straightforward, and I already have a proof of concept ready.
The only point is to get the exact definition of the distortion profiles, so exact mathematical formulas and/or parameters for each of them are welcome (I currently use a simple formula with a range of values).
How many different profiles do you have? I supposed they all have a name (a lens model maybe)? Just trying to figure out the best layout for that screen... Do you want the app to have the same layout on iPad, or do you prefer something different? Also, do you want the user to apply the distortion on the full-size image, or on a screen-size image? Depending on the exact formula, applying the distortion on a full-size image can take a few seconds (varies depending on the exact hardware). Do you need icons, start-up screens, etc. to be designed, or are you providing those?
If you provide the graphical elements and all the details of the distortion profiles, I should be able to send you the finished project within 3 days, possibly quicker.
Let me know if you have any questions or if you can clarify the points above.
Zhenxiang