Building a Scalable E-commerce Backend with Nextjs and PostgreSQL

Overview

Build a scalable, backend-first e-commerce system using Next.js 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: APIs, Utilities & 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 the Next.js App Router API route model 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 course establishes the data flow that powers checkout in the final course.
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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). The last unit aligns the code with the full course outcome.
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Make tax a first-class part of your e-commerce backend. You'll add a dedicated tax rates table, expose a small admin-style Tax Rates API, and let carts choose a tax country so totals update in real time.