A Power BI developer must have strong skills in data modeling, DAX (Data Analysis Expressions), Power Query, and data visualization. They should be proficient in connecting Power BI to multiple data sources like SQL databases, Excel, or cloud platforms. A solid understanding of business intelligence concepts, analytics, and report optimization is essential. Power BI development company also need strong problem-solving abilities to tailor Power BI solutions to specific business needs. Additionally, good communication skills are crucial to collaborate with stakeholders, gather requirements, and provide training or support when needed.