Hire dedicated Power BI developer technical skills, conduct practical tests or ask for a portfolio showcasing their previous work. Provide a sample data set and ask the candidate to create a dashboard, demonstrating their proficiency with DAX, Power Query, and data modeling. Review their ability to visualize data effectively and create interactive, user-friendly reports. Additionally, ask them to explain their process for integrating multiple data sources and handling large datasets. Their approach to solving these tasks will give you insight into their technical capabilities and problem-solving skills.