Vue interviews focus on the reactivity system, the Composition API, and component communication. Below are the most common questions with model answers. Senior: architecture, trade-offs, mentoring, and decision-making.
By feature rather than by type: a folder that holds a feature's components, composables and store together, instead of a components directory with two hundred files. Shared code moves out only when a second feature actually needs it. The dependency direction matters more than the folder names — features may use shared, shared may not know about features.
Team familiarity first, since both are capable and neither decision is technical enough to override that. Beyond it: Vue's single-file components and built-in reactivity mean less assembly for a team that does not want to choose a state library and a styling approach. React wins where the hiring pool or an existing component library decides it.
Component by component, when a component needs work anyway — both APIs run side by side, so there is no flag day. Extract composables first from the logic that repeats across files, because that is where the payoff is; converting a simple presentational component gains nothing. A rewrite with no product change is the first thing cut when priorities shift.
Measure it in CI so a regression is visible in the pull request rather than in a Lighthouse run months later. Route-level code splitting, dynamic imports for anything heavy and rarely used, and a hard look at dependencies — a date library or an icon set imported whole is the usual surprise. A budget that fails the build is what makes any of this stick.
Deep reactivity on a large object, since Vue tracks every property and a ten-thousand-row array becomes ten thousand proxies — shallowRef or freezing the data avoids it. Then watchers that trigger each other, and computed chains deep enough that one change recalculates a tree. General web performance still dominates, but these are the ones a profiler blames on the framework.
In a real interview you speak under pressure. Cam asks these same questions, scores every answer, and shows exactly what to fix.
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