A LESS developer utilizes the LESS preprocessor language to enhance CSS coding. They improve web designs by creating reusable and maintainable stylesheets, reducing redundancy and complexity. They use variables, mixins, functions, and operators to create dynamic styles, creating responsive and efficient web pages. LESS developers also perform debugging and testing, ensuring cross-browser compatibility. Their work involves collaboration with front-end developers, integrating LESS stylesheets into web applications. They may also be responsible for maintaining and updating existing stylesheets, keeping up with evolving web standards, and improving website performance. They often use tools like Grunt or Gulp for task automation.