Strangler Fig Pattern: Routing, Data and Cutover

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The strangler fig pattern step by step: choosing the first slice, putting a routing layer in front of the legacy system, giving every data set one owner, cutting over in reversible steps and keeping the migration from stalling, with a loyalty-points example.

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Product & strategy28 May 2026

Legacy Modernization with the Strangler Fig Pattern: Routing, Data and Cutover

The strangler fig pattern replaces a legacy system one capability at a time behind a routing layer. Here's how to choose the first slice, give every data set one owner during the transition, and plan each cutover and its recovery path.

Strangler Fig

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Legacy Modernization with the Strangler Fig Pattern: Routing, Data and Cutover