A DataStage Developer designs, develops, and manages ETL processes using IBM DataStage to extract, transform, and load data from multiple sources into target systems. They are responsible for optimizing job performance, troubleshooting issues, ensuring data quality, and collaborating with business stakeholders to meet data integration needs. The role includes creating data mappings, performing tests, automating tasks, maintaining existing workflows, and ensuring compliance with data security and privacy standards. Additionally, the developer documents processes and supports ongoing data integration efforts within the organization.