Java Developer for Native Call Notification in Flutter App

I need an experienced Java developer to implement native Android functionality in my Flutter app. The app should detect incoming, outgoing, missed, and received calls, even when the app is killed or running in the background. Based on the type of call, it should automatically send different types of WhatsApp messages.

Requirements:

- Detect call events (missed, received, outgoing) even if the app is not running.
- Trigger different WhatsApp messages(via API) based on call type.
- Implement native Java code and integrate it with Flutter using platform channels.
- Handle required permissions for calls.
Skills Required:

Java (Android native)
Flutter (Platform channels)
Background services, BroadcastReceivers, and JobSchedulers in Android.
Please share relevant experience and how you’d approach this project.