A LEMP developer specializes in creating web applications using the LEMP stack, which consists of Linux, Nginx (pronounced Engine-x), MySQL, and PHP. They manage the server environment, ensuring its efficiency and security. They design, implement, and test databases, using MySQL for data storage and retrieval. They write server-side scripts in PHP, handling the logic of the application. They also configure Nginx to serve the application to clients. They can work on various stages of development from conceptualization, design, development, testing, to deployment. They also troubleshoot issues, optimize performance, and maintain the application after deployment.