Custom Product Marketplace Development

I'm seeking an experienced developer to create a custom-built product-based marketplace website. The site should include:

- User Authentication: Secure sign-up/login for users.
- Product Listings: Comprehensive and organized product display.
- Payment Gateway Integration: Seamless and secure transactions.

Ideal skills and experience:
- Proven track record in building custom marketplaces
- Strong expertise in user authentication and payment gateways
- Experience with product listing management

Please provide examples of similar work and your approach to this project.