A Liberty Profile developer primarily works on IBM's WebSphere Application Server Liberty Profile, a dynamic and light-weight runtime environment for Java-based applications. They design, develop, and implement software applications and microservices, ensuring optimal performance and scalability. They have a deep understanding of Java, JEE, and OSGi applications. They often collaborate with other developers and stakeholders to identify and resolve issues, optimize code, and enhance functionality. A Liberty Profile developer also maintains and updates the server environment, conducts testing and debugging, and ensures compliance with industry best practices. They constantly learn new technologies to improve their skills and the applications they work on.