Django Backend for E-Commerce Platform -- 2

I'm looking to develop a robust backend for my Shopify-like e-commerce platform using Django. The frontend and database are already prepared, so you would focus solely on the backend.

Key Requirements:
- User authentication and authorization: Secure login and registration processes for different user roles.
- Payment processing: Integrating reliable payment gateways to handle transactions smoothly.
- Product management: A comprehensive system for adding, updating, and removing products.

User Roles:
- Admin: Full access to the platform for monitoring and control.
- Vendor: Access to manage their own products and sales.
- Customer: The end-user, able to browse and purchase products.

Third-party Service Integration:
- Payment gateways: Ensuring secure and varied payment options for users.
- Shipping services: Integrating with reliable shipping services for order delivery.
- Email marketing tools: Enabling vendors to reach out to their customers effectively.

Ideal Skills and Experience:
- Extensive experience with Django framework.
- Proven track record in developing e-commerce platforms.
- Familiarity with integrating third-party services.
- Strong understanding of user authentication systems.
- Knowledge of product management systems in an e-commerce context.