Developr with Amazon sales and Apple mobile app experience

I have an small Amazon retail store that sells books, also a mobile app account with Apple. I need a developer with experience in both these areas to update and drive sales on both platforms. The Amazon account sells my book Going th Wrong Way, by ebook, Audio and paperback it is successful but requires SEO and marketing.
The mobile apps re old and need updating to relaunch.
The successful candidate will be experienced in both these areas and be able to update and build online sales.