Multi-Vendor E-Commerce Platform Development

I'm seeking an experienced developer to create a multi-vendor e-commerce site akin to Amazon or Jumia, specifically designed for the East African market.

Key Requirements:
- Seller registration and product listing capabilities
- A seamless buyer interface with intuitive purchase process
- Comprehensive admin panel for efficient inventory management
- Integration of Mpesa and card payment systems
- Basic warehousing/inventory management features
- Mobile-first, responsive and scalable design

Design Preference:
- The site should follow a modern and minimalist design style.

Product Focus:
- The primary focus of the platform will be basically all non food products

Ideal Skills and Experience:
- Proven expertise in e-commerce website development
- Familiarity with the East African market is a plus
- Ability to design a modern and minimalist interface
- Experience in developing mobile-first and responsive websites

Please include in your proposal:
- Your portfolio
- Proposed tech stack
- Estimated timeline
- Cost estimate