Wanted: QR code based inventory tool

I have a business that has 5000 unique items that go in and out of inventory each month. Each item is already laser etched with a QR code that is encoded with a unique serial number. I'd like to find a cloud based app inventory tool to track when items go out and come back in.

Any suggestions or does someone want to build this iOS app?

The initial scan would have to import the serial numbers. I've got an app that will handle everything else but requires me to physically enter the serial #s on the front end and I simply don't have the time to do this.