Cross-Platform Spam Call Detector App

I'm looking for an experienced Android or Flutter developer to help me create a spam call detection app for both Android and iOS. The app will feature real-time call detection, number blocking, and a caller ID display.

Project Requirements:
- Cross-platform development (Android & iOS)
- Real-time call detection functionality
- A number blocking feature
- Caller ID display
- A system for updating a spam numbers database both automatically from a server and manually by the user

Ideal Skills & Experience:
- Proficient in Android and/or Flutter development
- Previous experience building similar call detection apps
- Strong understanding of cross-platform development
- Ability to implement real-time features and server communication
- Good UI/UX design skills for an intuitive interface