Frontend
Component Library
A shared set of reusable, pre-built UI components (buttons, forms, modals) with consistent styling, often documented and previewed in a tool like Storybook, so teams don't rebuild the same pieces repeatedly.
Think of it like
Like a hardware store's catalog of standard-sized doors and windows that every contractor on a job pulls from, instead of each one custom-building their own.
Junior or senior?
Junior sounds like
Has only consumed a component library someone else built.
Senior sounds like
Has built components for a shared library and can describe a design decision behind one.
Ask them
“Did you build components for a design system, or mainly consume one another team maintained?”