A Data Virtualization developer is responsible for designing, implementing, and managing solutions that integrate data from various sources into a single, unified view. They work on data abstraction, federation, and transformation to ensure seamless data access across multiple platforms. They also ensure real-time or near-real-time data delivery for better decision-making. Other tasks include optimizing data queries, maintaining data security and privacy, and troubleshooting data-related issues. They are skilled in data virtualization tools like Denodo, data modeling, and SQL. Their role is crucial in organizations that deal with large volumes of heterogeneous data, helping to improve data agility and business intelligence.