A Liferay Portal Developer is responsible for designing and developing enterprise applications using Liferay Portal and Java technologies. They build Liferay themes, portlets, and extensions, customizing them as per client requirements. They also integrate Liferay with other systems, ensuring seamless data flow. They are involved in the entire software development lifecycle including requirement analysis, design, coding, testing, and maintenance. Additionally, they troubleshoot issues and optimize performance. They work closely with cross-functional teams to ensure the smooth deployment and functioning of applications. Their role requires strong technical skills in Liferay, Java, web technologies, and a good understanding of databases and servers.