Building a Scalable E-commerce Backend with Nextjs and PostgreSQL | CodeSignal Learn

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Building a Scalable E-commerce Backend with Nextjs and PostgreSQL

Software Engineering

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5 courses

60 practices

8 hours

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.

Earn a shareable

Certificate of Achievement

Verified skills you'll gain

ADVANCED

API Integration, Design, & Development

ADVANCED

Data Management and Database Querying

Tools you'll use

Nextjs

PostgreSQL

TypeScript

Course 1

Backend Foundations: APIs, Utilities & Catalog Endpoint

3 lessons

12 practices

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.

Course 2

Products API: CRUD, Search, and Pagination

3 lessons

12 practices

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.

Course 3

Carts API: Line Items, Totals, and Inventory Snapshots

3 lessons

12 practices

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.

Course 4

Orders API: Checkout Workflow and Order State Transitions

3 lessons

12 practices

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.

Course 5

Tax API: Country-Based Rates and Checkout Snapshots

3 lessons

12 practices

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.

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