Senior Full-Stack Developer / Agency Needed for Multi-Vendor Digital Marketplace with Escrow System

I am looking for an experienced senior full-stack developer or development agency to build a professional multi-vendor digital marketplace platform similar to Plati.Market, Etsy, and other large digital marketplaces. The platform will allow multiple sellers to list and sell digital products and services while buyers can purchase securely through an integrated escrow-based payment system. This is a serious long-term project. I am looking for someone who has already built complex marketplaces, payment workflows, wallet systems, or escrow-based platforms.