A Lotus Domino developer designs, develops, and manages applications using IBM's Lotus Domino software. They create and modify forms, views, and scripts using LotusScript, JavaScript, and HTML. They also manage Domino databases, ensuring data integrity and security. They collaborate with other IT professionals to integrate Lotus Domino applications with other systems. Their role also involves troubleshooting and resolving issues that arise within the Lotus Domino environment. They may also train users on how to use the applications they create. Technical knowledge required includes understanding of Lotus Notes, Domino server, and other IBM technologies.