Cross-Platform Mobile App Development

I'm looking for an experienced mobile app developer to create a cross-platform application for both iOS and Android. The app will include the following key features:

- User Authentication
- Push Notifications
- In-app Purchases
- Chat Functionality
- Inventory Management and Restocking
- Task Assignment
- Scheduling
- Reporting

Ideal skills and experience:
- Proficiency in mobile app development for both iOS and Android
- Experience with user authentication and in-app purchase integration
- Strong knowledge of chat functionalities and push notification services
- Background in building inventory management and task assignment modules
- Ability to design and implement scheduling and reporting features

Please provide examples of previous work and any relevant qualifications.