Hello,
One of the preferred freelancers and a iOS-specific developer here.
So from my understanding, what you want is a app for recipes with filters based on allergies (or allergens).
Basically, when a user opens the app, he will create a profile for himself, with name and some basic details and checkbox based allergens to tick mark. There will be 8 (or more) allergens to select from.
The recipes will be stored in a backend database and have fields like id,title,image,ingredients,source, etc. and a field for allergens to specify if they contain any allergens or ingredients as allergens.
So when a user searches for a recipe, his search will run a search in database for all recipes BUT excluding the ones that contain allergens specified in his profile.
From there, he can view the recipe by taping on it, favorite it or email it.
Favorited recipes show up on the main screen below his saved profile name or a individual screen for favorites.
Aside this, the recipe view screen will have options to rate a recipe and leave a review for it, at the same time, any ratings and reviews left by other users will be visible.
First time app launch will show a Legal Disclaimer as well.
My bid includes all the 3 components for this project:
1. The iPhone and iPad universal app
2. The backend MySQL database
3. The php REST API to interface between the app and database
Please do know though, that due to the limited budget, a minimal UI will be provided.
Regards