A MariaDB developer designs, develops, and maintains databases using MariaDB, an open-source relational database management system. They create complex query definitions that allow data to be extracted and used to address various business requirements. Their role also involves optimizing database systems for performance efficiency, conducting troubleshooting, and ensuring data security and integrity. They work closely with other developers to integrate databases with applications, and may also be involved in data migration, translation, and scripting. Their goal is to ensure the database supports user needs, remains accessible, secure, and well-organized. They also stay updated with the latest industry trends.