QR-Based Memorial Platform Rebuild

I am seeking a full custom SaaS rebuild of RememberMe, a QR based memorial platform that links engraved stainless steel plaques to digital memorial profiles containing photos, videos, audio recordings, obituaries, biographies, timelines, and family submitted content.
This is a ground up rebuild designed for long term scalability (millions of users), performance, and security, not a template site.
Key Requirements:
Scalable cloud-based backend architecture
Secure user authentication and account management
Media storage and optimization (photos, video, audio)
Stripe integration for e-commerce checkout
Automated unique QR code generation tied to profiles
Short, engraving-friendly URL system
Public memorial pages (SEO optimized)
Robust admin dashboard with:
User management
Order management & fulfillment tracking
Content moderation tools
Analytics and reporting
QR asset export for engraving
Ideal Skills and Experience:
Proven experience building custom SaaS platforms
Strong backend and database architecture knowledge
Experience with Stripe and e-commerce systems
Cloud media storage (AWS, etc.)
QR code system implementation
Clean, scalable UI/UX for both users and admin
Looking for a developer or team capable of delivering a secure, scalable, production-ready system. Please share relevant SaaS projects, recommended tech stack, timeline, and portfolio.