Full stack project: Build AI-Powered Content Creation SaaS Platform from Scratch

We need an experienced full-stack developer to build a content automation platform that leverages AI for creative workflows. We have an MVP prototype that you can review for requirements, but we're open to a complete rebuild with proper architecture.
Your Decision: Refactor or Rebuild

After reviewing our prototype and requirements, you'll advise whether to:

Build fresh with clean architecture (likely preferred)
Salvage usable components from existing MVP
Your recommendation based on best practices

Core Functionality Required

Multi-step content generation workflow
AI service integration for automated content creation
Media file processing and manipulation
Project management system with auto-save
Cloud storage integration

Technical Requirements

You choose the final stack, but must include:

Modern React or Next.js frontend
Node.js backend (Express/Fastify/NestJS - your choice)
PostgreSQL with proper ORM
TypeScript throughout
AI API integrations (OpenAI, Google Cloud)
Media processing capabilities
Professional deployment ready

Deliverables

phase 1: Architecture plan and tech stack recommendation after reviewing MVP
phase 2-3: Core backend with database, auth, and API structure
phase 3-4: Frontend with polished UI and workflow implementation
phase 5-6: AI integrations and media processing
phase 6-7: Testing, optimization, and deployment
phase 8: Documentation and handover

Required Experience

✅ Built at least 2 production SaaS applications from scratch
✅ Strong system design and architecture skills
✅ Expert-level React and Node.js
✅ Experience with AI APIs (OpenAI, Anthropic, or Google)
✅ Media processing experience (audio/video)
✅ Can create scalable, maintainable code architecture
✅ Understands modern deployment and DevOps
What We Provide

Clear requirements document
Access to existing MVP for reference
UI/UX preferences and design direction
Quick feedback and decision-making

Why This Project Is Different

You have full autonomy on technical decisions
No legacy code to maintain (unless you choose to)
Building with latest technologies
Potential for long-term collaboration
Performance-based bonus opportunity

To Apply, Answer These:

Stack Choice: What tech stack would you recommend for a scalable content generation platform and why?
Timeline: Can you deliver a production-ready platform fairly soon?
Portfolio: Link to a SaaS platform you built from scratch
Approach: Would you rebuild or refactor based on this description?
Rate: Fixed price quote for complete project OR hourly rate