Cross-Platform Multimedia Production App Development

I'm looking for an experienced app developer to build a feature-rich multimedia productions app for both Apple and Android. This cross-platform application will primarily focus on being a paid music player for artists, as well as hosting my DJ sets and podcasts. Along with a paid booking system

Key Features:
- An integrated paid music player and podcast platform
- A graphic design viewer for 2D and 3D designs with purchase options for downloads
- YouTube integration
- A booking system that syncs with calendars such as Google and Apple
- An online merchandise and jewellery store
- An events page
- A bio and contact information section with a messaging system

Ideal Skills & Experience:
- Proficiency in developing cross-platform applications
- Previous experience in creating multimedia production apps
- Knowledge of integrating e-commerce features within an app
- Familiarity with calendar sync systems
- Experience in implementing messaging systems within an app

The priority for this project is to focus on the paid music player and podcast functionalities and booking system.

Please provide relevant samples of your previous work with multimedia applications when bidding.