ETL Tester

ETL (Extract, Transform, Load) Tester

Roles and Responsibilities:

• Analyze ETL mapping documents, source-to-target mappings, and business requirements

  to understand data flow and transformation rules.

• Design, develop, and execute comprehensive test plans, test cases, and test scripts

  for ETL processes and data warehouse components.

• Perform extensive data validation and reconciliation

  between source and target systems to ensure data accuracy, completeness, and integrity.

• Write complex SQL queries

  to validate data transformations, data loads, and referential integrity constraints.

• Identify, document, and track defects

  using defect management tools, collaborating with developers to ensure timely resolution.

• Develop and maintain reusable SQL scripts and testing artifacts

  for future testing cycles.

• Validate data aggregation, calculations, and reporting logic

  within the data warehouse environment.

• Participate in all phases of the SDLC (Software Development Life Cycle)

  and STLC (Software Testing Life Cycle) with a focus on data quality.

• Collaborate closely with ETL developers, data architects, business analysts, and report developers

  to ensure alignment on data requirements and quality standards.

• Perform performance testing

  on ETL processes to ensure optimal loading times and system scalability.

• Contribute to the continuous improvement

  of ETL testing processes and methodologies.

• Generate test reports and metrics

  to communicate testing progress and data quality status to stakeholders.

Required Skills and Qualifications:

• Proven experience as an

  ETL Tester

  or Data Warehouse Tester.
• Strong proficiency in

  SQL

  for data querying, analysis, and validation (including complex joins, subqueries, and analytical functions).
• Solid understanding of

  data warehousing concepts, ETL methodologies, and dimensional modeling (Star Schema, Snowflake Schema)

  .
• Experience with various

  ETL tools

  (e.g., Informatica PowerCenter, DataStage, SSIS, Talend) for understanding data flows.
• Ability to read and interpret

  ETL mapping documents

  and data models.
• Experience with

  defect tracking tools

  (e.g., Jira, Azure DevOps) and test management tools.
• Strong analytical and problem-solving skills with meticulous attention to detail.
• Excellent communication skills (written and verbal) and ability to articulate complex data issues clearly.
• Knowledge of scripting languages (e.g., Python) for automation of test data generation or validation is a plus.