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Updated weekly · Last refresh Aug 30

WNS Software Engineer Interview Questions

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

30questions
~4htotal time
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1
CodingStart here. 7 questions · ~57 min
Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingWNS
Interface vs Abstract ClassEasy

Explain how interfaces and abstract classes differ in purpose, inheritance model, and implementation sharing.

ArraysStringsWNS
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2
System Design3 questions · ~25 min
Scalable Web App DesignHard

Tests system design skills for scalability, reliability, and performance under growth.

InfrastructureFeature StoreModel ServingWNS
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3
Execution5 questions · ~41 min
Performance Optimization ImportanceMedium

Tests your understanding of performance bottlenecks and how you measure and improve system efficiency.

Trade-offsSuccess CriteriaRisk AssessmentWNS
Estimating Module DurationMedium

Tests your estimation technique, planning discipline, and risk awareness.

Trade-offsRoadmappingScope ManagementWNS
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4
Behavioral & Leadership12 questions · ~98 min
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5
More topics3 questions · ~25 min
Securing a Web ApplicationMedium

Tests your security mindset across authentication, authorization, vulnerabilities, and secure development practices.

InfrastructureCommunicationOwnershipWNS
SQL and Analytics Problem SolvingMedium

Assesses SQL problem-solving and your ability to connect analytics tools to business outcomes.

analyticssqlWNS
WNS Automation PipelinesMedium

Evaluates your experience designing and implementing automation pipelines and orchestration patterns.

OrchestrationAutomationWNS
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
The finish line: interview-readyComplete all 30 questions plus 3 hands-on drills to finish this plan.