Yellow Pages Booking App Development

I'm looking to develop a mobile app that functions like a yellow pages directory but with added functionality to allow users to book or contact businesses directly. The app should be user-friendly and efficient, enabling users to connect with local businesses via phone calls or messages/chats.

Key Requirements:
- Business listings will be added and managed solely by me, the app owner.
- Users should be able to contact businesses via phone calls or messages/chats within the app.

Ideal Skills and Experience:
- Experience in mobile app development
- Proficiency in building user-friendly interfaces
- Strong backend development skills to manage business listings
- Experience with integrating communication features like chat/messaging

Please provide samples of previous work and estimated time for completion.