Enhanced iOS Contacts App Development

I'm looking for an experienced iOS app developer to create a mobile app that presents my device's contacts with some customised enhancements. The app should interact seamlessly with the addressbook on my device using the device API. (In other words, not a webapp as we do not want to call addressbooks via the Internet.)

Key Features:
1. Custom Fields: The app should include additional fields against the contacts for custom notes, dropdown fields, links to other contacts, and date fields
2. Furthermore, the app should allow the addition of a LinkedIn profile to an existing user using the iOS ‘Share via’ function
3. The additional data in the app should be saved to the user’s iCloud account. There should be no authentication or cloud storage in the app.

Two main screens will be

1. Contact detail: a CRUD of all of the data outlined above, plus core fields from the device address book (Name, email, phone etc)

2. A searchable, sortable list

Ideal Skills:
- Proficient in iOS app development (ReactNative, Flutter or Swift)
- Experience with device API integration
- Using standard iOS libraries

I will handle submission via my Apple Developer account.

Please provide your portfolio showcasing similar projects you have worked on, and outlining how you would provide code to me.