A TCG ripping platform

I'm looking for a long-term technical development partner who can help me build this properly. I have a Shopify storefront that I want to use as the initial foundation, also have a beta app that shows a rough draft of what im already working on. But my long-term goal is to develop a standalone web application and eventually iOS and Android apps. I have a few questions before moving forward: 1. Can you show me a live ecommerce or SaaS application that you personally built using React, Next.js, and Node.js? 2. Have you integrated Shopify with an external backend using Shopify APIs? 3. Have you built any randomized product, mystery box, digital pack-opening, or similar systems? 4. How would you architect a system where a customer purchases a pack, the backend securely determines the result, records it, and displays the result through an interactive opening experience? 5. Would you recommend keeping Shopify as the storefront and building a separate backend, or eventually moving everything into a standalone application? 6. Would you personally handle development, or would members of your team work on the project? 7. What could you realistically build for an initial $500–$850 milestone? I am working with a limited startup budget, so I want to build in stages while maintaining ownership of the source code, intellectual property, and infrastructure. 8.Could you work off my rapidnative beta app that I already started or need to start at Zero? I would appreciate your thoughts on the architecture, timeline, and development approach.