Shopify Real-Time Inventory Sync Engine

Project Overview

Pazarly operates as a multi-channel e-commerce business selling across Shopify, regional marketplaces, and wholesale channels simultaneously. As order volume scaled, their biggest operational bottleneck became inventory: stock levels updated on one channel would lag minutes or hours behind on others, causing oversells, cancelled orders, and hours of daily manual reconciliation. We engineered a serverless synchronisation layer using AWS Lambda as the execution engine. Shopify webhooks fire events on every inventory movement — orders, returns, manual adjustments — and Lambda processes these events in near real-time, pushing corrected stock figures back to all connected channels within seconds. The architecture is event-driven and stateless, meaning it scales automatically with order volume without any infrastructure management. The Lambda function was written in Node.js and integrated directly with the Shopify Admin API, with idempotency logic built in to handle duplicate webhook deliveries gracefully. Custom error handling and a dead-letter queue ensured no inventory events were silently dropped during API timeouts or transient failures. CloudWatch alarms were configured to alert the team instantly if the sync pipeline fell behind. The results were immediate: inventory discrepancies dropped by 90%, oversells effectively disappeared, and the operations team recovered several hours per day previously spent on manual stock reconciliation — time that was reinvested into growth.

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