A Java developer designs, implements, and manages Java-based applications, integrating Java modules into complex software solutions. They leverage Java 's features such as Lambda expressions, Stream API, and Date API to write more efficient and compact code. They also test code to ensure robustness, including edge cases, usability, and general reliability. They troubleshoot and debug applications, provide software documentation, and maintain system functionality. Java developers often collaborate with front-end developers to integrate user-facing elements with server-side logic, ensuring high performance and responsiveness. They also adhere to best coding practices and maintain code quality.