Multivendor Ecommerce Platform Development

I need a multivendor ecommerce platform similar to StoreHippo. I'm open to suggestions for alternative companies that offer similar solutions.

Key features required:
- User-friendly interface
- Payment integration
- Vendor management

Platform Preference:
- Not on WordPress, Magento, or Shopify; open to other options

Design Preference:
- Modern and minimalist style

Ideal Skills and Experience:
- Experience in developing multivendor ecommerce platforms
- Strong background in UI/UX design for modern interfaces
- Expertise in payment gateway integration
- Proficiency in vendor management systems

Please share your relevant experience and any similar projects you've completed.