I need a bilingual (Spanish-English) full-stack developer to build the first release of a SaaS platform that helps sellers import products from Amazon and AliExpress, run AI-powered optimizations, and publish listings seamlessly to Mercado Libre, eBay, and Shopify... (Budget: $250 - $750 USD, Jobs: Amazon Web Services, API Development, Full Stack Development, Node.js, PHP, PostgreSQL, Python, Website Design)