Productivity App Development

I'm looking for an experienced app developer to create a productivity tool focused on task management. The app's functionalities are confidential but will include key elements for efficient task organization.

Essential requirements:
- Expertise in mobile app development (iOS and Android)
- Strong background in UI/UX design for intuitive user experience
- Experience with secure handling of confidential information
- Proficiency in implementing task management features

Ideal Skills:
- App development (React Native, Flutter, etc.)
- Task management systems
- Data security and privacy

Please provide a portfolio showcasing similar projects.