I have gone through your job posting and become very much interested to work with you. I am an expert in this field. I have already completed several projects like this. For evidence you can see my profile.
Data Integration : Talend and Pentaho.
Data visualization : PowerBI, Mondrian OLAP, OpenText BIRT, Pentaho and Jasper Reports.
Databases : PostgreSQL, SQL Server.
Big Data Integration and Analytics: Talend BigMore