Building a Scalable E-commerce Backend with Remix and PostgreSQL

Overview

Build a scalable, backend-first e-commerce system using Remix and PostgreSQL. This course path emphasizes API design, service-layer architecture, data persistence, and refactoring for production readiness. You’ll work with realistic constraints and patterns used in real-world backend systems.

Syllabus

Course 1: Backend Foundations: API Contracts & First Catalog Endpoint
Course 2: Products API: CRUD, Search, and Pagination
Course 3: Carts API: Line Items, Totals, and Inventory Snapshots
Course 4: Orders API: Checkout Workflow and Order State Transitions
Course 5: Tax API: Country-Based Rates and Checkout Snapshots

Courses

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Set up a consistent API contract, reusable request/response helpers, and your first e-commerce endpoint. You’ll learn Remix’s resource route model (API endpoints implemented via loader/action) and establish the foundation that every other endpoint will reuse.
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Expand the catalog API into a full CRUD surface: create products, fetch them by ID, update fields safely, and archive records. You’ll also practice mapping validation failures and conflicts to correct HTTP status codes.
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Introduce shopping carts and cart items. You’ll create carts, add and update items, and return computed totals. This module establishes the data flow that powers checkout in the final module.
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Finish the backend with checkout and orders. You’ll convert carts into orders transactionally and implement order listing plus state transitions (pay/cancel).
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Make tax a first-class part of the backend. You'll add a tax rates configuration API, allow carts to pick a tax country, and ensure checkout snapshots tax details onto orders so historical totals remain stable even when rates change.