High-Concurrency Omnichannel Inventory Allocation & POS Synchronization Engine
Engineered a centralized real-time inventory ledger and distributed checkout synchronization platform connecting legacy POS terminals, Shopify, and Amazon storefronts.
Executive Summary & Mandate
Organization Profile: Multi-Brand Fashion & Apparel Retailer (65 Brick-and-Mortar Outlets, 3 Online Marketplaces)
Core Engineering Mandate: Inventory desynchronization caused frequent stockouts, double-selling on marketplaces during flash sales, and $180k in cancelled orders.
The Legacy Bottlenecks (Before)
- Batch CSV file synchronization between warehouse ERP and online stores ran only once every 4 hours.
- Stores frequently declined click-and-collect orders because walk-in shoppers had bought the items minutes prior.
- Markdowns and flash sales required manual repricing across separate POS databases and marketplace accounts.
- End-of-month physical stock reconciliations required shutting stores down for 2 full days.
Engineering Approach & Implementation (During)
Distributed Stock Reservation & Locks
Implemented atomic Redis distributed reservation locks preventing parallel transactions from reserving the last remaining stock unit during high-traffic flash campaigns.
Universal POS & Marketplace Webhook Engine
Constructed lightweight background synchronization agents that connect retail POS cash registers to the central cloud catalog within 1.2 seconds of barcode checkout.
Intelligent Store-Fulfillment Allocation
Designed algorithmic dispatch routing that fulfills online deliveries from the closest physical outlet with surplus stock, reducing last-mile shipping times by 1.8 days.
Architectural Safeguards & Protocols
- Event-sourcing ledger architecture guaranteeing full historical auditability of every SKU transition
- Optimistic locking and atomic rollback mechanisms ensuring zero duplicate inventory deductions
- Resilient queue retry logic with Redis workers ensuring continuous POS synchronization even during internet dropouts
Quantified Operational Impact (After)
- Completely eliminated double-selling cancellations during peak festive sales campaigns.
- Reduced average customer delivery fulfillment lead-time from 4.2 days to 1.6 days via ship-from-store.
- Unlocked a 23% revenue increase by exposing physical in-store stock to nationwide online buyers.
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