AI-Based Platform Development with React, FastAPI & PostgreSQL

I am looking to build an AI-based platform with the following core modules:
- AI Executive Assistant
- CRM & Lead Management
- Customer 360
- Document Management
- Knowledge Base
- WhatsApp Communication Hub
- Workflow Automation
- Analytics Dashboard
- Business Health Dashboard

Technology Proposal:
Phase 1 - HTML Prototype
Phase 2 - React Frontend Development
Phase 3 - Backend using FastAPI
Phase 4 - PostgreSQL Database Setup
Phase 5 - AI Integration

Development Roadmap:
- Sprint 1: UI Foundation (Landing, Login, Dashboard, AI Executive)
- Sprint 2: CRM & Customer Modules Development
- Sprint 3: Communication & Knowledge Base Modules Integration
- Sprint 4: Automation & Analytics Implementation
- Sprint 5: Administration and MVP Delivery

Expected Deliverables:
1. Interactive Prototype with complete UI/UX Design.
2. PRD (Product Requirements Document).
3. Database Design and API Documentation.

I'm initially focusing on a web platform, so expertise in the selected tech stack is essential. Previous experience with similar projects or AI-based platforms will be a plus.