E-commerce Android App Development

I'm looking for a skilled mobile app developer to create a top-notch E-commerce app specifically for the Android platform.

Key Requirements:
- Proficient in Android app development
- Experienced in e-commerce app creation
- Understanding of UI/UX principles for mobile
- Familiarity with secure payment integration
- Ability to implement smooth navigation and fast loading times

Your role will involve creating a user-friendly, efficient, and secure E-commerce app. Please provide samples of your previous work in your proposal.