As a freelance developer, I have gained valuable experience in Java and UNIX. In Java, I have worked on various projects ranging from web development to desktop applications. I have utilized popular frameworks like Spring, Hibernate, and Struts to build scalable and robust applications. I have also worked with different Java libraries for data manipulation, networking, and testing. In UNIX, I have worked with different command-line tools and shell scripting to automate various tasks, manage file systems, and monitor system performance. These skills have allowed me to deliver high-quality solutions to my clients, ensuring optimal performance and scalability.