Android Water Delivery App

I'm looking for a skilled developer to create a water delivery app on Android. The app should include:

Core Functionalities:
- Order placement
- Delivery tracking
- Payment gateway integration

User Authentication:
- Social media accounts

Ideal skills and experience:
- Experience in developing Android applications
- Strong knowledge in integrating payment gateways
- Familiarity with social media authentication
- Experience with delivery tracking systems

Please provide samples of previous work and estimated delivery time.