How One Team Migrated Multiple Production Apps Using AI Without Breaking UX

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A frontend team successfully migrated several production applications — some nearly a decade old — into a unified design system without disrupting the user experience users had come to rely on. The migration involved Angular codebases of varying complexity, including a finance platform with 70 admin routes and another with over 550 screens across 26 modules. Rather than starting with components, the team first extracted design tokens from existing stylesheets, assigning role-based names to visual values like colors and spacing to ensure consistency across apps. An AI agent was used to read, catalogue, and build components, while a pipeline involving token extraction, fingerprinting, clustering, and three-tier testing kept the process structured and auditable. The approach is described as framework-agnostic, meaning it can apply to any migration involving screens, components, and users with established behavioral expectations.

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