An AWS RDS developer manages and designs database solutions on Amazon Web Services' Relational Database Service. They handle tasks such as setting up, operating, and scaling a relational database in the cloud. This includes migrating data from on-premise servers to AWS RDS, troubleshooting issues, maintaining database performance, and implementing security measures. They also optimize the database environment for cost-efficiency and performance. The developer ensures the seamless integration of RDS with other AWS services and applications. They need to have a solid understanding of SQL, cloud computing, and database technologies.