ETL Tester (Chicago)

· Experience in data / ETL testing, including strategy ownership on at least one large migration or re-platforming programme · Proven reconciliation and equivalence testing — demonstrating that a rebuilt pipeline produces output equivalent to a legacy one, and defending that conclusion to stakeholders · Expert SQL — complex analytical validation queries written independently against unfamiliar schemas Databricks / PySpark for validation at data volume Python for test automation and harness deve…