Python Automation Testing (ETL Testing) @ Cognizant

Job Description

Work model : Hybrid

Job location : Bangalore

Job Description

We are looking for a skilled Python Test Engineer with strong ETL and Data Testing experience to validate data pipelines, data warehouses, and large-scale data integrations. The ideal candidate will have hands-on experience in Python automation, SQL validation, and ETL testing across complex data ecosystems.

Key Responsibilities

• Design and execute ETL test cases for data extraction, transformation, and loading processes
• Validate source-to-target data mapping, transformations, aggregations, and business rules
• Develop and maintain Python-based automation frameworks for data testing
• Write complex SQL queries for data validation and reconciliation
• Perform data quality checks (completeness, accuracy, consistency, duplication)
• Test data pipelines built on cloud or on-prem platforms
• Collaborate with Data Engineers, Analysts, and Business teams to understand requirements
• Identify, log, and track data defects through closure
• Support regression, performance, and reconciliation testing for ETL jobs

Required Skills

• Strong proficiency in Python (pytest / unittest / custom frameworks)
• Solid experience in ETL Testing & Data Warehousing concepts
• Excellent SQL skills (joins, subqueries, CTEs, window functions)
• Hands-on experience with ETL tools (Informatica, Talend, SSIS, DataStage, etc.)
• Experience validating data in RDBMS (Oracle, SQL Server, PostgreSQL, MySQL)
• Understanding of data models, star/snowflake schemas
• Experience with Unix/Linux commands
• Familiarity with Agile/Scrum methodologies

Good to Have

• Cloud data platforms: AWS (Redshift, Glue, S3) / Azure (ADF, Synapse) / GCP (BigQuery)
• Big Data technologies: Spark, Hive, Hadoop
• CI/CD tools: Jenkins, Git, GitHub Actions
• API testing experience for data services
• Exposure to data migration or data lake testing

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Keyskills:   Python automation testing ETL Testing SQL ETL automation