Cross-Platform AI-Powered To-Do App

I'm looking for an experienced developer to create a robust to-do app available on iOS, Android, and Web platforms. The app should have the following core functionalities:
- Task creation and management
- Reminders and notifications
- Collaboration features

Additionally, I want to integrate AI to assist users with:
- Smart task suggestions
- Voice recognition for task entry
- Automated reminders based on usage patterns

Ideal candidates should have:
- Proven experience in developing cross-platform apps
- Strong knowledge of AI integration
- Expertise in user-friendly UI/UX design
- Solid background in mobile and web development

Please provide samples of your previous work and a brief outline of your approach to this project.