Cross-Platform APK & Admin Panel Development

I need an APK developed for both Android and iOS platforms. Additionally, I require a comprehensive admin panel with the following functionalities:

- User Management: Add, edit, and remove users.
- Analytics and Reporting: Track usage metrics and generate reports.
- Content Management: Create, update, and delete content.

User authentication and login functionality is also needed.

Ideal skills and experience:
- Proficiency in cross-platform mobile app development
- Experience in building robust admin panels
- Strong knowledge in implementing secure user authentication
- Familiarity with analytics tools and content management systems

Please provide examples of previous work and a detailed plan.