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Issue 031TeardownIntegrationsRef 093

Tax engine integrations that survive a Black Friday spike: Avalara, Vertex and the patterns that matter

Tax calculation engines like Avalara and Vertex provide complex, real-time tax assessments. Effective integration for high-volume periods, such as Black Friday, relies on strategic caching, asynchronous processing, and robust error handling to prevent bottlenecks and system failures.

Andrew Pemberton· Development Director
4 min readReviewed January 2025
"Integrating external tax engines requires strategic caching, asynchronous processing, and robust error handling to prevent bottlenecks during peak trade."
Written by
Andrew Pemberton, Development Director at iWeb
Andrew Pemberton
Development Director
19 years at iWeb

Andrew leads the development practice at iWeb and owns the delivery runbooks behind large commerce migrations. He writes about release governance, deployment sequencing, parallel-run strategy, and the engineering decisions that reduce operational risk during complex transformation programmes. Focused on stable delivery, observable systems, and migration approaches that avoid unnecessary disruption to trading.

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