A graph database developer designs, implements, and maintains databases using graph theory. They utilize graph structures for semantic queries with nodes, edges, and properties to represent and store data. Their tasks include creating efficient and secure databases, writing and optimizing database queries, troubleshooting and resolving database issues. They also work on data modeling, data import/export, and provide API for developers. They ensure data integrity, availability, and optimization to meet business needs. They collaborate with other teams to integrate systems and may also conduct research to suggest improvements for database performance and security.