Multi Vendor E Commerce

I am looking for a talented freelancer that can help me implement an effective multi-vendor e-commerce solution for my business. The platform I'm looking for is Shopify, as it hits the perfect balance between power, features and customization. Furthermore, I will need it to come integrated with different payment gateways so that customers have enough options to choose from. Finally, it will be great if I could also set up a customer loyalty program to reward loyal customers. If you think you've got the skills to design and deliver such a solution, I'd love to hear from you.