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Updated weekly · Last refresh Aug 30

WNS QA Engineer Interview Questions

The questions to prepare for a WNS QA Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
ExecutionStart here. 30 questions · ~244 min
Decide What to AutomateEasy

Explain how you decide which tests to automate versus keep manual, balancing risk, cost, and long-term maintenance.

Trade-offsRisk AssessmentScope ManagementWNS
Handle Scope Changes Mid-DevelopmentMedium

Explain how you manage scope changes during development without losing delivery control, stakeholder alignment, or product quality.

AgileScope ManagementProject ManagementWNS
Prioritize Testing Under Time PressureEasy

Explain how you would prioritize test cases under a tight release timeline while balancing risk, scope, and release confidence.

Trade-offsRisk AssessmentScope ManagementWNS
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2
SQL & Data Manipulation12 questions + 3 drills · ~127 min
Validate Data After TransactionsMedium

Tests your understanding of post-transaction verification to ensure data integrity in QA.

JoinsData WranglingAggregationsWNS
SQL Validation for Backend DataMedium

Tests your ability to use SQL to validate backend data integrity for WNS delivery.

JoinsData WranglingAggregationsWNS
SQL Missing Records ChecksMedium

Tests your ability to detect data gaps using SQL set logic for WNS QA validation.

SubqueriesJoinsData WranglingWNS
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
Second Highest Without AggregatesHard
Practice
Recently asked
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
Monthly Sales Aggregation by Product CategoryEasy
Practice
Practice drill

Aggregate monthly sales totals by product category using JOINs, GROUP BY, and date formatting.

WalgreensRevLatentView Analytics
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3
Coding4 questions · ~32 min
Page Object Model for AutomationEasy

Tests your automation design skills for maintainable UI test frameworks.

ArraysData WranglingWNS
Core Java or Python ConceptsEasy

Tests your programming fundamentals that directly impact automation reliability and maintainability.

Hash TablesArraysStringsWNS
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4
Behavioral & Leadership4 questions · ~32 min
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.