A React developer builds user interfaces with React, the JavaScript library for composing interactive components. Their work covers web apps and sometimes React Native mobile apps, and teams bring one in when an interface is complex and must stay fast.
A design system is a shared library of reusable interface components, design tokens and usage guidelines. Teams use it to build consistent, accessible products faster across screens and platforms.
A frontend developer builds the parts of a website or web app that people see and use in the browser, turning designs into fast, accessible interfaces. Teams usually bring one in when the interface is how customers judge the product.
Server-side rendering (SSR) is a technique where the server builds the full HTML for a page on each request and sends it to the browser. Content appears quickly and search engines can read it easily.
A single-page application (SPA) is a web app that loads one HTML page and then updates the view in the browser with JavaScript as users navigate. New data comes from APIs instead of full page reloads.
A frontend framework is a library or toolkit for building the parts of an application users see and interact with. It gives structure to components, state, routing and rendering, so teams do not hand-roll them.
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