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2026-01-15

Real-Time Inventory Sync: Connecting HubSpot CMS with E-commerce Backends

By Trunk Tech Solutions
#HubSpot CMS#Integrations#E-commerce#Performance

Real-Time Inventory Sync for HubSpot CMS

A luxury retail brand wanted to use HubSpot CMS for its high-end aesthetic but needed real-time inventory levels to prevent overselling. Their inventory lived in a custom-built SQL database with no native HubSpot connector.

The Challenge

  • High Traffic: The site needed to handle flash sales with thousands of concurrent users.
  • Low Latency: Inventory checks needed to happen in milliseconds to ensure a smooth UX.
  • Data Integrity: Stock levels had to be 100% accurate across the website and the physical warehouse.

The Solution

We implemented a hybrid architecture combining HubSpot CMS with a custom middleware layer.

  1. Serverless API: We built a high-speed API on AWS Lambda that proxies requests to the SQL database.
  2. Custom Modules: Developed HubSpot CMS modules that use client-side fetching to show "Live Stock" badges.
  3. Webhooks: Implemented a bidirectional sync where sales on the site immediately reserve stock in the backend.

The Result

  • Sub-100ms Response Times: Inventory data loads almost instantly.
  • Zero Overselling: Stock levels are perfectly synced across all channels.
  • Marketing Control: The marketing team can now launch campaigns knowing the technical infrastructure will scale.

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