1) Wrote complex SQL Queries involving multiple tables with joins. 2) Worked on Informatica Utilities Source Analyzer, warehouse Designer, Mapping Designer, Mapplet Designer and Transformation Developer. 3) Developed and maintained ETL (Extract, Transformation and Loading) mappings to extract the data from multiple source systems like Oracle, SQL server and Flat files and loaded into Oracle. 4) Involved in Performance Tuning of mappings in Informatica.