A Data Warehouse Developer is a professional responsible for designing, building, and maintaining data warehouses, which are centralized repositories of data used for reporting and analysis. They work with databases, ETL (Extract, Transform, Load) tools, and data modeling techniques to ensure data is stored and organized efficiently. Data Warehouse Developers collaborate with data analysts and business users to understand their reporting needs and create data structures that support these requirements. They play a crucial role in ensuring that an organization's data is accessible, accurate, and ready for decision-making.