E-commerce & Payments

Shopping Cart Implementation

Build a full-featured shopping cart system with product variants, quantity management, discount codes, cart persistence, abandonment recovery, and support for both guest and registered user checkout.

Complexity: Medium 13-21 effort units 3-5 weeks
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Project Milestone & Feature Breakdown

4
Project Milestones
8
Features
21
Total Effort Units
1

Core Cart Functionality

Implement cart operations and state management

5 pts 1 week 2 Features

Cart Operations

3 pts Medium

Add, update, remove items with variants

Cart Persistence

2 pts Simple

Save cart state for logged-in and guest users

Deliverables
  • Cart API
  • State management
  • Cart persistence
2

Pricing & Discounts

Implement discount codes and price calculations

5 pts 1 week 2 Features

Discount Engine

3 pts Medium

Support percentage, fixed, and BOGO discounts

Tax & Shipping Calculation

2 pts Simple

Calculate taxes and shipping based on location

Deliverables
  • Discount system
  • Tax calculator
  • Shipping calculator
3

Checkout Flow

Build checkout process for guests and users

8 pts 1-2 weeks 2 Features

Multi-Step Checkout

5 pts Complex

Shipping, payment, review checkout steps

Guest Checkout

3 pts Medium

Allow checkout without account creation

Deliverables
  • Checkout flow
  • Guest checkout
  • Order confirmation
4

Cart Abandonment Recovery

Recover abandoned carts with email campaigns

3 pts 3-5 days 2 Features

Abandonment Tracking

1 pts Simple

Track cart abandonment events

Recovery Email Campaigns

2 pts Simple

Automated emails to recover abandoned carts

Deliverables
  • Abandonment tracking
  • Email campaigns
  • Recovery analytics

Technical Stack

React Node.js PostgreSQL Redis Stripe SendGrid

Key Considerations

Cart performance with many items

Handling inventory changes during checkout

Security of discount code system

Cart persistence strategy

Mobile-optimized checkout experience

Success Criteria

Cart operations fast and responsive

Discount codes applied correctly

Abandoned cart emails increase conversions

Guest checkout conversion rate high

No inventory race conditions

Related Use Cases

View All Use Cases
Medium

Payment Gateway Integration

8-13 effort units 2-3 weeks
Complex

Inventory Management System

21-34 effort units 5-8 weeks
Medium

Order Fulfillment Automation

13-21 effort units 3-5 weeks

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