Comprehensive Single & Multi-Vendor eGrocery and eCommerce Website

I am looking for a seasoned web developer to create a robust eCommerce platform that accommodates both single-vendor eGrocery and multi-vendor eCommerce functionalities. The website should be mobile-friendly and capable of hosting a wide range of products akin to Amazon.

Key Features:
- Vendor Management System: This should include vendor registration and profiles, order and inventory management, as well as payment processing integration.
- ERPNext Integration: Seamless integration with ERPNext for inventory and accounts is a must.
- Mobile Accessibility: I need mobile applications that mirror the website's functionalities.
- Marketing Tools: The site should have capabilities for product-related discounts and promotions, campaigns, and advertising.
- Value-Adding Features: Any additional features that can enhance the platform's value will be appreciated.

Ideal Skills and Experience:
- Proven experience in developing eCommerce platforms
- Proficiency in integrating ERP systems
- Skills in mobile app development
- Knowledge of implementing vendor management systems
- Experience with creating features for discounts, promotions, and campaigns.