Senior Data Quality Engineer Toronto

Build reliable data pipelines with SQL and Python as a Senior Data Quality Engineer for Zonda in Toronto, Ontario. This is an in-office role Monday through Friday.CoStar Group seeks a senior engineer to validate enterprise data from ingestion through published output. You will test ETL/ELT pipelines, reconcile large datasets, automate quality checks, and translate business definitions into measurable scenarios. The work supports critical data products across Zonda’s real-estate information platform.Key Responsibilities:
Design end-to-end pipeline and regression testing strategiesPerform source-to-target reconciliation across large datasetsBuild automated validation frameworks using SQL, Python, and dbtCreate curated datasets covering edge cases and historical conditionsValidate high-risk releases before production publicationRequirements:
Six or more years in data quality or related engineeringStrong ETL/ELT and production data-testing experienceAdvanced SQL for reconciliation, comparison, and validationStrong scripting or test-automation skills, preferably PythonExperience with Snowflake, dbt, Airflow, AWS Glue, or comparable frameworksBring data-testing fundamentals, automation capability, and analytical depth to strengthen Zonda’s enterprise data quality in Toronto.
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