Custom Ecommerce Backend API for a Clothing Brand

Design Documentation

Architecture, technical decisions, and implementation details.

Architecture

Fullstack system — API monolith on Render/Neon, storefront proxy on Vercel, auth flow, concurrency and reporting pipeline.

Updated September 2026

API Design

Seventy-seven endpoints under /api/v1 — envelope, validation, security and PDF reports per request.

Updated September 2026

Data Model

Twenty-four tables, variant modeling, immutable order snapshots, audit trail, and public IDs.

Updated August 2026

Functional Requirements

What customers and administrators can do, by role — 23 requirements including financial reports.

Updated September 2026

Non-Functional Requirements

Security, reliability, the 1,132-test strategy, observability and honest gaps.

Updated September 2026

Architecture Decisions

Nine key choices — sessions, uploads, concurrency, IDs, snapshots, edge proxy, module layering, payment gateway and PDF reports.

Updated September 2026