A Data Guard developer is responsible for creating and managing Oracle Data Guard configurations, which provide data protection solutions for Oracle databases. They ensure high availability, data protection, and disaster recovery for the enterprise data. They design, test, and implement Data Guard systems, monitor their performance, troubleshoot any issues, and ensure they meet business requirements and objectives. They also perform switchover and failover operations when necessary. Additionally, they may be involved in data migration, backup and recovery processes, and enhancing system performance. Familiarity with Oracle technologies and strong problem-solving skills are key for this role.