The development of the user interface of websites and web applications, which ensures their interaction with users. The main technologies are HTML for structure, CSS for styling and JavaScript for adding interactivity. Modern front-end actively uses https://fivecube.agency/front-end-development front end development services, libraries and frameworks such as React, Vue.js and Angular, which help create efficient and scalable web applications. The work of a front-end developer includes page layout, adaptation for different devices, integration with the backend via API, performance optimization and testing. Important tools are module assemblers, style preprocessors, TypeScript for improved typing and version control systems such as Git.