Android eCommerce Delivery App for Groceries

I need an Android application for my eCommerce delivery business focusing on groceries. This app should have the following key features:

- Customer Reviews: The app should allow customers to leave reviews on their shopping and delivery experience. This will help us improve our service and build trust with our customers.

- Order Tracking: The app must provide real-time GPS tracking of orders, allowing customers to see exactly where their groceries are. It should also provide delivery time estimates, helping customers know when to expect their order.

Ideal skills and experience for this job would include:
- Proficiency in Android app development
- Experience with eCommerce and delivery apps
- Knowledge of integrating GPS tracking systems
- Expertise in creating user-friendly interfaces for customer reviews
- Understanding of implementing in-app notifications for delivery time estimates

Please note, this app is specifically for groceries. It should be designed with this in mind, taking into consideration the unique requirements and challenges of delivering grocery items.