Uses best practices in data engineering, data warehouse development and integration with enterprise systems   Key responsibilities include:  Develops complex data extracts, applications, and ad-hoc queries as requested by internal and external customers using ETL toolsets Conducts complex ETL processes and troubleshooting Defines requirements for ETL solutions, ensure data quality and match-back to core systems transaction results Identifies and documents process for building data models across multiple complex areas of Ameren’s business (e