intermediate

Building a Scalable E-commerce Backend with Nextjs and PostgreSQL

Software Engineering

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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.

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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.

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.

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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.

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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.

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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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I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Building a Scalable E-commerce Backend with Nextjs and PostgreSQL

Trusted by learners working at top companies

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

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