Developer Builds Full-Stack Fashion E-Commerce Platform with FastAPI and MySQL

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A developer has detailed the architecture behind a full-featured fashion e-commerce platform built using FastAPI, Pydantic v2, and MySQL with SQLAlchemy ORM. The platform supports product catalogs, size and color variants, cart, checkout, JWT authentication, order tracking, and a wishlist. A key design decision was a separate ProductVariant table to manage individual stock counts per size-color combination, mirroring patterns used by real fashion retailers. Instead of a machine learning model, the project uses a rule-based size recommendation engine that scores user measurements against size charts and returns confidence scores with plain-language explanations. Checkout functionality was made demo-ready through a mock PaymentGateway interface that simulates card, UPI, and cash-on-delivery flows, designed to allow easy integration of real providers like Stripe later.

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