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BackendIntermediate ~22h Premium

E-Commerce Platform

Catalog, cart, checkout, orders, admin — the full loop.

Build an e-commerce app with the moving parts that actually ship: a catalog, a cart, a checkout that survives page refreshes, an admin area, and an order lifecycle that can recover from failed payments.

CatalogCheckoutOrdersAdminInventory

What you'll build

  • Product catalog with categories and variants
  • Persistent cart that survives sign-in
  • Checkout with address + payment
  • Order lifecycle: created → paid → shipped → delivered
  • Admin dashboard for products and orders
  • Inventory holds during checkout

What you'll learn

  • Model a catalog you can extend without rewriting
  • Design a checkout flow that handles retries cleanly
  • Coordinate inventory, payment, and order state safely
  • Build a usable admin without leaking it to customers

Key flows

The end-to-end paths your data takes through the system.

Checkout lifecycle

From 'Add to cart' to 'Order placed'.

Add to cart
Enter address
Pay
Webhook confirms
Order created
Email sent

Inventory hold

How stock is reserved during checkout to avoid overselling.

Cart locked
Hold placed
Pay
Hold → committed
Stock decremented

Build steps

A step-by-step path. Each milestone leaves you with a working slice.

  1. 1

    Catalog & products

    Schema, listing, detail pages, variants.

  2. 2

    Cart

    Anonymous + authenticated carts, merging on sign-in.

  3. 3

    Checkout

    Address, payment, idempotent confirmation.

  4. 4

    Orders

    State machine, webhook handler, customer-facing order page.

  5. 5

    Admin

    Protected routes, product CRUD, order overview.

  6. 6

    Inventory

    Holds during checkout, release on cancel/timeout.

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Read & study before you build

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