Smart Doorbell Face Recognition System

I'm looking to develop a smart doorbell system focused on monitoring visitor activity. The primary platform for this system should be Android.

Key Features:
- Face Recognition:
- Identify known visitors
- Send alerts for unknown faces
- Store visitor images

The ideal candidate should have experience with:
- Android app development
- Image processing and face recognition technologies
- Database management for storing visitor images
- Security protocols to protect user data

Please provide examples of similar work done.