Grocery App and Website Development

I'm looking for a developer to create a grocery shopping app and corresponding website. This project will include both frontend and backend development, as well as database management.

Core Features:
- User registration and login
- Grocery store listing with search and filters
- Shopping cart, checkout, and payment options
- Real-time order tracking
- Reviews and ratings

Backend Features:
- Vendor management system for store owners
- Inventory management for partnered stores
- Delivery management and route optimization

Technology Stack:
- Frontend: React.js
- Backend: Python (Django/Flask)
- Database: PostgreSQL
- Payment Gateway: Razorpay, PayU, or Stripe (to be decided)
- Real-Time Tracking: Google Maps API or Mapbox (to be decided)

Ideal skills for this job include:
- Proficiency in React.js for frontend development
- Expert knowledge of Python (Django/Flask) for backend
- Strong experience with PostgreSQL for database management
- Familiarity with payment gateways and real-time tracking APIs

I'm looking for a professional who can handle both the design and functionality of the app and website, ensuring a seamless user experience. Please provide examples of similar projects you've completed in your proposal.