A Lumension developer is responsible for creating and maintaining security software systems. They work on solutions that protect computer networks from threats like viruses, malware, and unauthorized access. Their tasks include software design, coding, debugging, testing, and updating. They also collaborate with other IT professionals to ensure that security policies are implemented correctly. Furthermore, they provide technical support and training to users, helping them understand and effectively use security systems. Their work contributes to the overall cyber security strategy of an organization, ensuring data integrity, confidentiality, and system availability.