Cross-Platform Productivity App Development

I'm looking for an experienced mobile app developer to create a productivity tool focused on task management. The app needs to be available on both iOS and Android platforms.

Key Features:
- Task management functionalities

Ideal Skills and Experience:
- Proven experience in mobile app development for both iOS and Android
- Strong expertise in building task management features
- Familiarity with UI/UX design principles for productivity apps
- Ability to integrate feedback and make iterative improvements

Please provide a portfolio showcasing similar projects and your approach to ensuring cross-platform functionality.