Data QA

Waisl Ltd; Bengaluru; On-site; INR 900,000 - 1,200,000; Full time

Job summary

Waisl Ltd in Bengaluru, India, is seeking a data validation tester to ensure data quality across source and target systems. You will verify ETL/ELT pipelines, write SQL queries, and automate checks.

Ideal candidates have strong SQL, experience with Python Selenium/Pytest, API testing, and knowledge of data warehousing concepts (Star/Snowflake). You'll collaborate with developers, analysts and product teams to validate dashboards and report quality.

Qualifications

• Experience testing ETL tools in a data environment.
• Knowledge of star/snowflake schema data warehousing concepts.
• Strong SQL skills including joins, aggregations, and window functions.
• Experience with API testing and validation.
• Familiarity with Python-based test automation using Selenium and Pytest.

Responsibilities

• Validate data accuracy between source systems and target systems
• Test ETL / ELT pipelines and data transformations
• Write SQL queries to verify data integrity
• Create and execute test cases for data validation
• Perform regression testing on data changes
• Identify, document, and track data defects
• Collaborate with Developers, Analysts, and Product teams
• Validate dashboards (Power BI / Tableau / Looker, etc.)
• Monitor data quality metrics and generate reports
• Automate data validation checks where possible

Skills

Strong SQL

Databases

ETL testing

Data warehouse concepts

Python with Selenium and Pytest

API testing

Tools

Selenium

Pytest

Job description

Key Responsibilities

• Validate data accuracy between source systems and target systems
• Test ETL / ELT pipelines and data transformations
• Write SQL queries to verify data integrity
• Create and execute test cases for data validation
• Perform regression testing on data changes
• Identify, document, and track data defects
• Collaborate with Developers, Analysts, and Product teams
• Validate dashboards (Power BI / Tableau / Looker, etc.)
• Monitor data quality metrics and generate reports
• Automate data validation checks where possible

Required Skills

Technical Skills

• StrongSQL knowledge (joins, aggregations, window functions)
• Understanding of databases
• Experience testing ETL tools.
• Basic understanding of data warehousing concepts (Star/Snowflake schema)
• Experience with Python with Selenium and Pytest.
• Knowledge of API testing