A Professional Data Engineer is a highly skilled individual who is responsible for designing, building, and maintaining scalable data processing systems that can handle large volumes of data. They have a strong understanding of data modeling, data warehousing, and data analysis, as well as experience working with cloud-based platforms such as Google Cloud Platform (GCP). To become a certified Professional Data Engineer, individuals must pass a rigorous exam that tests their knowledge and expertise in areas such as data processing systems design, data storage, and analysis, as well as GCP infrastructure and security. By earning this certification, individuals demonstrate their proficiency in the field of data engineering and their ability to deliver successful data-driven solutions to organizations.