Job Title: ETL Tester Location: Poland (Permanent Employment), work model: hybrid. About the Role As an ETL (Extract, Transform, Load) Tester, you'll be instrumental in ensuring accurate, reliable, and high-performing data pipelines across systems. Your work will help maintain data integrity, ensure high-quality analytics, and empower data-driven decision-making. Responsibilities • Develop and execute ETL test cases and strategies • Perform source-to-target data validation for completeness and accuracy • Validate transformation logic and verify business rule mapping • Conduct data quality checks and anomaly detection • Automate ETL testing using scripting languages • Collaborate with cross-functional teams (data engineers, developers, analysts) • Log and manage defects using tools such as JIRA, HP ALM, or TestRail • Document test plans, results, and audit artifacts • Participate in performance and volume testing • Ensure data governance and compliance (GDPR, HIPAA) • Support CI/CD workflows by integrating ETL tests into pipelines Must-Have Skills Requirements SQL & Querying - Strong SQL for complex source-to-target validations ETL Tools-Experience with Informatica, IDMC Data Modeling - Understanding of dimensional modeling (Star/Snowflake schemas) Scripting - Python, Shell, or PowerShell for automation Data Profiling - Knowledge of tools for quality checks and profiling Integration & Governance - Understanding of business rules and compliance standards Test Tools - Experience with JIRA, HP ALM, TestRail, Zephyr Comparison Automation - Familiarity with QuerySurge, Datagaps Cloud Knowledge - Basic understanding of Azure data services Performance Testing - Validating ETL performance under high-volume scenarios CI/CD Integration - Experience integrating tests in automated deployment workflows Nice-to-Haves • Hands-on experience with Azure services • Several years in ETL testing or data quality assurance • Certifications in ETL tools or cloud platforms • Exposure to big data tech like Hadoop, Spark Cognizant is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.