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Updated weekly · Last refresh Aug 30

Cognizant Data Scientist Interview Questions

The questions to prepare for a Cognizant Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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~3htotal time
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1
PipelinesStart here. 3 questions · ~27 min
Data Quality in ETL PipelinesEasy
Recently asked

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCognizant
Visualization Tools for Analytics PipelinesEasy
Recently asked

Discuss which visualization tools fit different analytics pipeline needs, and why warehouse integration and monitoring matter.

ToolsData ModelingQualityCognizant
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2
Machine Learning3 questions · ~27 min
Feature Engineering and Model PerformanceEasy
Recently asked

Explain how feature engineering improves supervised model performance and how to validate its impact with proper evaluation.

Feature EngineeringBias-Variance TradeoffSupervised LearningCognizant
Handle Imbalanced Classification DataMedium
Recently asked

Build a classifier for a highly imbalanced dataset and choose metrics, sampling, and thresholds that fit the minority class.

Cross-ValidationFeature EngineeringSupervised LearningCognizant
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3
Behavioral & Leadership5 questions · ~45 min
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4
More topics6 questions · ~54 min
Top Customers by Sales RevenueEasy
Practice
Recently asked

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsCognizant
Understanding Type I and Type II Errors in TestingMedium
Recently asked

Differentiate between Type I and Type II errors in hypothesis testing with a practical example.

Hypothesis TestingStatistical SignificanceP-ValuesCognizant
Common Pitfalls in Experiment ResultsHard
Recently asked

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchCognizant
First Checks for Metric DropsEasy
Recently asked

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosisCognizant
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 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 and Third Max in SQLEasy
Practice
Practice drill

Use DENSE_RANK to find the second and third highest distinct billing rates in Cognizant project rate cards.

sqlCognizant
The finish line: interview-readyComplete all 17 questions plus 2 hands-on drills to finish this plan.