audio recording app for iPhone and Android

Please read the whole discription before you bid. I want an app made for both iOS and android. it is an audio recording app that needs to save the past 15 seconds of audio every time you press the button. i want a website built with just information on the app, use Dropbox's API in the app, and make the app send the user notifications to their phone. The very most i will pay for this project is $1500. i will not respond to any bids that are higher that $1500. If you can do it cheaper the better. some one that has great experience in audio manipulation can do this easily.