Cross-Platform Grocery App Development

I'm looking for an experienced mobile app developer to create a grocery app for both iOS and Android platforms. The app should allow users to register and log in using email and password.

Key Features:
- Product search and filters
- Shopping cart
- Order tracking

Ideal Skills and Experience:
- Proven experience in developing cross-platform mobile apps
- Strong knowledge of user authentication protocols
- Expertise in implementing search, cart, and order tracking functionalities

Please provide samples of previous work related to similar projects.