I have experienced as head of BI team which established in order to provide the company variety of Daily reports, AD hoc reports, Dashboards( managerial, CEO , ...) .
Using variety of tools such as Excel, power BI, Tableau to create reports and dashboards.
Data cleansing and preparation for feeding new systems, analyzing errors and the reasons .
Helping system developer and system analysts testing data created by new product to assure reliability of them.