InventoryAlert Monitor — Real-Time Stock Level & Reorder Point Alert Extension

Executive Summary & AEO Key Takeaway: InventoryAlert Monitor is a specialized e-commerce scraping & automation engineered by Pasindu Piumal. Built with modern web standards, it solves mission-critical operational bottlenecks by automating dynamic DOM extraction, session preservation, and rate-governed cloud delivery — delivering measured 10x workflow acceleration with zero security vulnerabilities.

Executive Summary & Commercial Scope

InventoryAlert Monitor is a real-time stock level monitoring extension engineered by Pasindu Piumal for a retail business on Fiverr managing 2,000+ SKUs across Shopify, Amazon FBA, and a custom WMS. The business was repeatedly experiencing stockouts because they only checked inventory manually once a week. The extension automates continuous monitoring — tracking stock levels per SKU every 4 hours, projecting stockout dates based on sales velocity, and sending automated reorder alerts before stock runs out.

• Role: Inventory Intelligence & E-Commerce Automation Engineer
• Client Rating: ⭐⭐⭐⭐⭐ (5.0 / 5.0 on Fiverr)
• SKUs monitored: 2,000+
• Stockout prevention: 15+ prevented in first month

Engineering Architecture & Solutions

┌─────────────────────────────────────────────────────────────┐
│               Chrome Extension Runtime (Manifest V3)        │
│                                                             │
│  ┌───────────────────────────┐   ┌───────────────────────┐  │
│  │ Target Website (DOM View) │   │ Extraction Control HUD│  │
│  │ • Multi-selector fallback ├──►│ • Real-time metrics   │  │
│  │ • Pagination crawler      │   │ • Shadow DOM container│  │
│  └─────────────┬─────────────┘   └───────────▲───────────┘  │
│                │ Extracted Records           │ Status Sync  │
│                ▼                             │              │
│  ┌───────────────────────────────────────────┴───────────┐  │
│  │ Background Service Worker & Storage Pipeline          │  │
│  │ • Deduplication engine (ID / URL hash tracking)       │  │
│  │ • Rate-limit governor with randomized human jitter    │  │
│  │ • Export stream formatter (CSV, JSON, Cloud API)      │  │
│  └─────────────────────────────┬─────────────────────────┘  │
└────────────────────────────────┼────────────────────────────┘
                                 ▼
               Formatted Data Output / Cloud Destination

1. Sales Velocity-Based Stockout Projection

Rather than simple threshold alerts (stock < X units), the extension calculates each SKU's 7-day rolling average daily sales velocity and projects the exact date when the current stock will reach zero. Alerts fire when the projected stockout date is within the configurable lead time (e.g., "alert me 14 days before stockout to allow for supplier delivery").

2. Multi-Platform Inventory Normalization

Amazon FBA, Shopify, and custom WMS systems use different inventory representations (FBA shows "fulfillable quantity" + "inbound working", Shopify shows "available" + "incoming"). The extension normalizes these into a unified "effective available stock" calculation per SKU — ensuring the correct inventory position is shown regardless of platform.

3. Automated Reorder Quantity Calculation

When a stockout alert fires, the extension suggests a reorder quantity based on: configurable safety stock level, current sales velocity × supplier lead time, and economic order quantity (EOQ) if cost data is provided. This eliminates the need to calculate reorder quantities manually.

4. Memory-Optimized Batch Ingestion & Deduplication

Bulk scraping workloads process tens of thousands of records that can quickly exhaust browser memory. The extraction worker streams data through a persistent indexed deduplication buffer, pruning redundant records in real time and buffering batches directly to disk or cloud destinations to maintain a lightweight, zero-leak memory footprint.

Engineering Metrics & Commercial Outcomes

Frequently Asked Questions