Buy and Sell Mobile App Development

I'm seeking an experienced Android developer to create a mobile app for buying and selling both physical and digital, old and new products. The app should cater to both buyers and sellers.

Key Requirements:
-User-friendly interface for easy navigation
-Secure user authentication and profile management
-Robust search and filter options for products
-Integrated chat system for buyer-seller communication
-Admin panel for managing users and listings

Essential features include:
- User profiles and ratings
- In-app messaging
- Secure payment processing
- Vendor listings

Ideal skills and experience:
- Proven Android app development expertise
- Experience with secure payment integration
- Strong UI/UX design skills
- Familiarity with user profile and rating systems
- In-app messaging functionality knowledge

Please provide a portfolio showcasing similar projects.