E-commerce Website Development

I'm in need of a skilled website developer to construct my E-commerce site. This site must include essential features like a shopping cart, a payment gateway, and the capacity for company registration (B2B). I do not want to use established platforms like WordPress, Shopify, or Magento, but rather I need an original, custom-developed site. The ideal freelancer for this project would have a vast experience in creating tailored e-commerce websites and have a strong understanding of secure payment gateway integration. They should also be able to implement a robust B2B registration system effectively.