Back to Portfolio

E-Commerce Platform

A modern, scalable e-commerce solution with real-time inventory management and secure payment processing

Timeline
3 Months
Team Size
3 Developers
My Role
Lead Full-Stack Developer
Industry
E-Commerce
E-Commerce Platform Dashboard

Project Overview

This e-commerce platform was designed to address the growing need for a modern, scalable online shopping solution. The project involved building a comprehensive system that handles everything from product catalog management to secure payment processing and real-time inventory tracking.

The platform serves both B2C and B2B customers, featuring a responsive web interface, admin dashboard, and RESTful API that can be integrated with mobile applications and third-party services.

Key features include dynamic product recommendations, advanced search and filtering, real-time chat support, multi-currency support, and comprehensive analytics dashboard for business intelligence.

Tech Stack

R
React
Frontend framework with Redux for state management
N
Node.js
Backend runtime with Express.js framework
M
MongoDB
NoSQL database with Mongoose ODM
S
Stripe
Payment processing and subscription management
A
AWS
Cloud hosting with S3 for file storage
R
Redis
Caching and session management

Key Challenges

Real-time Inventory Management
Managing inventory across multiple sales channels while preventing overselling required a robust real-time synchronization system that could handle high traffic loads and concurrent transactions.
Performance at Scale
The platform needed to handle thousands of concurrent users during peak shopping periods without compromising on page load times or user experience.
Payment Security
Implementing PCI DSS compliant payment processing while maintaining a smooth checkout experience required careful architecture and security considerations.

Solutions & Implementation

Event-Driven Inventory System
Implemented an event-driven architecture using Redis pub/sub for real-time inventory updates. This allowed instant synchronization across all sales channels and prevented overselling through atomic database operations.
inventory-service.js
// Real-time inventory management with Redis pub/sub
class InventoryService {
  constructor() {
    this.redis = new Redis(process.env.REDIS_URL);
    this.subscriber = new Redis(process.env.REDIS_URL);
    this.setupSubscriptions();
  }

  async updateInventory(productId, quantity, operation = 'decrease') {
    const multi = this.redis.multi();
    
    // Atomic inventory update
    if (operation === 'decrease') {
      multi.hincrby(`inventory:${productId}`, 'available', -quantity);
      multi.hincrby(`inventory:${productId}`, 'reserved', quantity);
    }
    
    const results = await multi.exec();
    
    if (results[0][1] < 0) {
      // Rollback if insufficient inventory
      await this.redis.hincrby(`inventory:${productId}`, 'available', quantity);
      throw new InsufficientInventoryError();
    }
    
    // Publish inventory update event
    await this.redis.publish('inventory:updated', JSON.stringify({
      productId,
      available: results[0][1],
      timestamp: Date.now()
    }));
    
    return results[0][1];
  }
}
Optimized Database Queries
Implemented MongoDB aggregation pipelines with proper indexing strategies, Redis caching for frequently accessed data, and connection pooling to optimize database performance under load.
Secure Payment Integration
Integrated Stripe Elements for secure payment processing with tokenization, implemented webhook handling for payment status updates, and added comprehensive error handling and retry mechanisms.

Results & Impact

The e-commerce platform successfully launched and exceeded performance expectations:

  • 40% increase in conversion rates compared to the previous system
  • 99.9% uptime achieved during peak shopping periods
  • 60% reduction in page load times through optimization
  • Zero overselling incidents since implementation of the inventory system
  • 200% growth in concurrent user capacity

The platform now serves as the foundation for multiple e-commerce ventures and has processed over $2M in transactions within the first six months of deployment.

View Source Code Discuss This Project