Shopify Multi-Vendor Marketplace Developer (eBay/Amazon Style)

I’m looking for an experienced Shopify developer or agency to build a complete multi-vendor marketplace. The concept is similar to eBay, Reverb, or Amazon Marketplace, where individual sellers can create accounts, list their own products, manage inventory, and receive payments. However, my marketplace will focus exclusively on collectible trading cards, making it much simpler than a general marketplace. My requirements include: * Shopify-based solution (this is very important) * Multi-vendor functionality * Seller registration and approval process * Seller dashboard for managing listings, inventory, and orders * Buyer accounts * Secure payment processing with automatic vendor payouts * Marketplace commission system * Product search, filtering, and categories * Ratings and reviews * Order tracking * Mobile-friendly design * Professional, modern user interface I have over 10 years of experience using Shopify and currently operate several successful Shopify stores, so I would strongly prefer to keep everything within the Shopify ecosystem rather than moving to another platform. I’m looking for someone who has already built similar marketplace websites. Please include examples of previous marketplace projects (especially Shopify marketplaces) in your proposal. If there are existing Shopify apps or solutions that can reduce development time while still providing a professional experience, I’m open to that approach as well. Please tell me: * Which Shopify apps or technologies you would use. * Whether you’ve built a similar marketplace before. * Your estimated timeline. * Your estimated cost. * Any recommendations you have for making this project scalable and easy to manage. I’m looking for someone who can not only build the platform but also advise on the best architecture and user experience.