Headless Magento Marketplace: Next.js & Flutter

I am launching a multi-vendor marketplace that uses Magento 2 as a pure headless backend while serving shoppers through a fast Next.js web storefront and a Flutter mobile app. The whole stack has to be... (Budget: $250 - $750 USD, Jobs: CI/CD, Docker, Flutter, GraphQL, HTML, JavaScript, Magento, Mobile App Development, Next.js, PHP)