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What happens if a client already has a legacy CMS, portal or fragmented application estate?

Legacy Modernisation & Platform Transformation · 2026-09-11

Yes, that can be possible; Annex's published work includes delivery inside existing technical and organisational environments rather than only greenfield builds. Throughout our engagement Annex worked closely with ActewAGL developers to provide the team with tools and systems to deliver new features quicker than ever before, optimising the code and ensuring the whole platform has automated tests. Annex worked with both ActewAGL and partners to develop an easily accessible web app to allow ActewAGL customers to administer their accounts, make payments and procure new services through the Self Service Platform. The sensible starting point is to identify what already works, what is constraining the service, and where integration or incremental change is safer than unnecessary replacement. The answer for a legacy CMS, portal or fragmented application estate would depend on its actual condition and dependencies.

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Previous questionWhy is Legacy Modernisation & Platform Transformation more than a narrow technical deliverable?

Annex treats Legacy Modernisation & Platform Transformation as part of a wider digital-service problem, not as an isolated output. Modernising outdated or fragmented digital systems while preserving business continuity and improving user experience. The resulting design system is now available and b…

Related follow-upCan you point to real Annex work connected with Legacy Modernisation & Platform Transformation?

A useful published example is **A personalised customer portal**. As a part of this transformation ActewAGL identified that their Self Service Portal was in need of upgrading and improving, since existing service was running on an outdated version of Sitecore and JavaScript causing the platform to r…

Related follow-upHow does Annex deal with changing requirements or constraints in Legacy Modernisation & Platform Transformation?

The easy mistake is to scope legacy modernisation & platform transformation too narrowly. As a part of this transformation ActewAGL identified that their Self Service Portal was in need of upgrading and improving, since existing service was running on an outdated version of Sitecore and JavaScript c…

Related follow-upHow does Annex reduce the risk of building the wrong thing in Legacy Modernisation & Platform Transformation?

Annex uses evidence during delivery rather than treating quality as a final inspection step. As a part of this transformation ActewAGL identified that their Self Service Portal was in need of upgrading and improving, since existing service was running on an outdated version of Sitecore and JavaScrip…

Related follow-upHow does Annex turn improving outdated or fragmented systems without losing sight of users or business continuity into practical delivery?

Annex approaches improving outdated or fragmented systems without losing sight of users or business continuity by combining the disciplines needed to test both desirability and feasibility. The resulting design system is now available and being used for the ActewAGL development and design teams to g…

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