Full Stack Web EngineeringRetail & Multi-Vendor Commerce

High-Performance Multi-Vendor E-Commerce Platform

Engineering an ultra-fast marketplace with real-time inventory synchronization, automated payment escrow, and an intuitive merchant analytics dashboard.

< 1.4s
Average Page Load
Mobile Largest Contentful Paint achieved consistently on 4G connections.
99.98%
Uptime Reliability
Maintained complete zero-downtime reliability during major seasonal promotional campaigns.
100%
Inventory Accuracy
Eliminated stock overselling errors across all concurrent peak sale transactions.
High-Performance Multi-Vendor E-Commerce Platform

Project Context & Business Overview

A fast-growing retail marketplace needed a scalable web platform capable of handling multi-vendor catalog management, simultaneous checkout transactions during peak sales events, and automated merchant settlements without system downtime.

The Problem & Operational Inefficiencies

01.

The client's previous monolithic e-commerce setup experienced severe checkout latency (exceeding 6 seconds) during flash sales.

02.

Inventory mismatches frequently occurred when multiple shoppers attempted to purchase the last available stock item simultaneously.

03.

Vendor onboarding was manual and fragmented, causing significant operational delays in publishing new product catalogs.

Core Engineering Requirements

  • Sub-2 second page loads across high-resolution product media on mobile 4G networks.
  • Atomic inventory reservation transactions to prevent stock overselling.
  • Split-payment gateway architecture with automated merchant payout calculations.
  • Role-based vendor management portal with real-time order fulfillment tracking.

The Architectural Solution

Architected a decoupled React and Node.js microservices-based web application with Next.js edge rendering for high-traffic catalog pages.

Engineered an ACID-compliant inventory locking service using Redis distributed locks and MongoDB transactions to guarantee stock consistency.

Implemented a secure payment pipeline supporting Stripe Connect and Razorpay with automated webhook validation and payout scheduling.

Key Features & Capabilities Delivered

Real-Time Inventory State Engine

Locks inventory items for 10 minutes during active checkout, automatically releasing reserved stock if the customer abandons the session.

Comprehensive Vendor Portal

Self-service onboarding, catalog bulk upload via CSV, real-time sales reporting, and automated shipping label generation.

One-Click Instant Checkout

Saved customer shipping addresses and tokenized card credentials enabling fast checkout on mobile browsers.

Key Implementation Details

💡 Optimized client-side bundle size by 42% through route-based code-splitting and dynamic image WebP format delivery.
💡 Implemented idempotent payment webhook processors to eliminate duplicate charge processing during network retry storms.

Engineering Learnings & Takeaways

Decoupling the catalog browsing experience from transaction processing is critical for maintaining responsiveness during flash promotions.

Optimistic UI updates paired with resilient background queue synchronization drastically improves mobile shopper satisfaction.

Technology Stack

Frontend
React 18Next.jsTailwind CSSRedux Toolkit
Backend & APIs
Node.jsExpress.jsRedis Distributed CachingRESTful Webhooks
Database & Storage
MongoDB Atlas (Replica Set)AWS S3 Image CDN
Deployment
DockerAWS ECSCloudflare Pro CDN
Underlying Service

Custom Web Application Development

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