App Development

I'm looking to develop a simple app which will work on both Android and iOS

Functionally will be very similar to Trustpilot. Where the user selects a bar or restaurant in England and gives them a service rating - 1 to 5 stars and a comment box (150 words)

There needs to claim a listing, suggest a listing and social media sharing. Backend administration function to moderate reviews, add new listings etc. We also need an option to report fake reviews