An SSIS ETL Developer is responsible for designing, developing, and maintaining ETL (Extract, Transform, Load) processes using SQL Server Integration Services (SSIS). They work with databases to extract data from various sources, transform it into the required format, and load it into a destination system such as a data warehouse. Their role includes optimizing ETL workflows, troubleshooting performance issues, and ensuring data accuracy. Additionally, they collaborate with database administrators, analysts, and business stakeholders to meet data integration requirements efficiently.