E-commerce Android App Development -- 2

I'm looking for a seasoned Android app developer with a strong background in e-commerce applications to create a feature-rich app for me.

Key Features:
- Payment Gateway Integration: The app should securely process transactions and support various payment methods.
- Product Search and Filter: Users should be able to easily find and sort products based on their preferences.

User Authentication:
- The app needs a secure and efficient email and password login system for user authentication.

Ideal skills for this project include:
- Proficiency in Android app development
- Extensive experience with e-commerce app development
- Strong understanding of secure payment gateway integration
- Skills in developing user-friendly product search and filter systems
- Experience implementing secure user authentication systems.

Prior experience in developing successful e-commerce Android apps will be a significant advantage. Please provide examples of your past work in this domain.