A Database System Developer designs, implements, and manages database systems. They determine the best database structure to fit the data requirements of a business or organization. They write complex queries, troubleshoot performance issues, ensure data integrity and security, and develop backup and recovery protocols. They also work with developers to improve applications and establish best practices. Database System Developers maintain the performance, integrity, and security of a database and develop processes for optimizing database security. They use specialized software to store and organize data. They also ensure the data is available to users and secure from unauthorized access.