How I led the critical refactoring of a high-scale B2C platform, migrating thousands of components from Vue 2.7 to Vue 3 with zero downtime and measurable performance gains.
A large-scale B2C platform, processing thousands of concurrent sessions during peak hours, was built on Vue 2.7 with Options API. The bundle was bloated, DX (Developer Experience) was degraded, and the lack of native TypeScript caused constant regressions in production. The team could not scale new features without introducing critical technical debt.
Instead of a risky big-bang, I opted for an incremental compatibility-based migration. Set up the Vue compatibility layer to allow Vue 2 and Vue 3 components to coexist in the same runtime. Established a test coverage baseline of 85% before touching any critical component. We created an internal styleguide requiring Composition API + script setup on all new components, while refactoring legacy ones in dedicated sprints.
We divided the migration into 4 phases: (1) Upgraded from Node 16 to 22, enabling Vite and modernizing the entire build chain; compat and tooling setup (Vite, TypeScript). (2) Base component and design system migration. (3) Core pages and checkout flows migration. (4) Compat mode removal and final optimization. Each phase had automated QA gates and visual regression tests via Chromatic.
The migration resulted in significant technical and business improvements. Build time dropped drastically, client-side performance improved, and the team was able to deliver new features 30% faster due to the enhanced DX of Vue 3 + TypeScript.
Large-scale framework migration is not just a technical problem — it is a change management problem. The decision to maintain compatibility during the transition was crucial to avoid production outages. Investing in automated tests before the migration paid exponential dividends. Finally, rigorous adoption of Composition API from the start prevented us from creating an unstable hybrid between two paradigms.
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