TL;DR — Amazon E-Commerce

Design a large-scale e-commerce platform similar to Amazon that supports millions of products, personalized search, shopping carts, and a checkout flow that handles flash sales without overselling. The system must serve hundreds of millions of daily active users browsing, searching, and purchasing products concurrently. Key features: Product catalog with rich attributes, categories, and variants (size, color). Full-text search with filters, facets, autocomplete, and spell correction.