Firebase Firestore Integration Specialist

I'm seeking an experienced developer to connect an existing app to Firebase.

Key Tasks:
- Integrate Firebase Authentication
- Connect to Firestore
- Model and structure data
- Set up security rules

Ideal skills and experience:
- Proficiency in Firebase, especially Firestore and Authentication
- Strong background in data modeling
- Experience with Firebase security rules
- Familiarity with integration in existing applications

Timeline: This project needs to be completed within 2 days.