Design an E-commerce Platform

Build an online shopping platform similar to Amazon that handles product catalog, cart, checkout, and order fulfillment.

Functional Requirements

• Browse and search product catalog
• Add items to cart and wishlist
• Checkout with multiple payment options
• Order tracking and history
• Inventory management
• Product reviews and ratings

Non-Functional Requirements

• Handle Black Friday traffic spikes (100x normal)
• Cart persistence across sessions
• Consistent inventory (no overselling)
• Sub-second product page loads

Questions to Consider

• How do you handle inventory consistency at scale?
• What caching strategy for the product catalog?
• How do you design the checkout for reliability?