Modern Productivity App Development

I'm looking for an experienced Android developer to create a modern productivity app. The app should include:

- Task Management: Create, edit, and organize tasks.
- Time Tracking: Monitor time spent on tasks.
- Calendar Integration: Sync with existing calendars.

Ideal skills and experience:
- Proficient in Android development (Java/Kotlin).
- Experience with task management and calendar integration APIs.
- Strong UI/UX design skills for modern app aesthetics.
- Proven track record of delivering high-quality apps on time.

Please include examples of similar projects in your bids.