---
title: How custom middleware put HubSpot at the test 3
description: Campbell Property Group unified five property brands under one HubSpot architecture with custom integrations built by Engaging.io.
---

[Our work](https://www.engaging.io/our-work)

# [How custom middleware put HubSpot at the test 3](https://www.engaging.io/our-work/how-custom-middleware-put-hubspot-at-the-centre-of-campbell-property-groups-sales-stack-clone-clone-1)

 Written by [Geff Harper](https://www.engaging.io/our-work/author/geff) | Nov 1, 2026, 2:52:44 AM

Campbell Property Group (CPG) is a family-owned residential developer with five business units: Clarendon Homes NSW, Clarendon Homes QLD, Domaine Homes, CPG Estates and home loan brokerage Loan Market Elevate (LME). Engaging.io built the custom middleware that connects HubSpot to the four specialist platforms behind every CPG sale.

[View full post](https://www.engaging.io/our-work/how-custom-middleware-put-hubspot-at-the-centre-of-campbell-property-groups-sales-stack-clone-clone-1)

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