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Updated weekly · Last refresh Oct 17

Cgi Nederland Data Scientist Interview Questions

The questions to prepare for a Cgi Nederland Data Scientist interview. Questions from real interview reports rank first. Updated daily.

32questions

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SQL & Data ManipulationStart here. 3 questions + 1 drill · ~37 min

SQL Rolling Average and RankingHard

Practice

Use CTEs and window functions to calculate 7-day transaction averages and rank Loft users within each region.

Window FunctionsRankingRunning Totals

Cgi Nederland

BI Tools Trade-offsEasy

Practice

Practice drill

Aggregate BI tool feedback to show each tool's good sides, bad sides, review count, and average rating.

analytics toolsbi toolsAggregations

CGI

Cgi Nederland

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A/B Testing & Experimentation3 questions · ~27 min

Design Test for New FeatureMedium

Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.

experiment designfeature evaluationA/B Testing

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Machine Learning5 questions · ~44 min

Choose the Right ML ModelMedium

Choose between regression, classification, random forests, and gradient boosting for a supervised business problem.

Ensemble MethodsSupervised LearningDecision Trees

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Statistics & Probability5 questions · ~44 min

Significant Result, Small Business ImpactMedium

Explain why a statistically significant experiment result can still have negligible practical value.

Confidence IntervalsStatistical SignificanceA/B Testing

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Behavioral & Leadership10 questions · ~89 min

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More topics6 questions · ~53 min

Choose Metrics for Imbalanced DataMedium

Choose the right evaluation metric for an imbalanced dataset and explain why accuracy can mislead.

F1 ScorePrecisionAUC-ROC

Cgi Nederland

Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser value

Cgi Nederland

Batch vs Streaming Data ProcessingEasy

Compare batch and streaming data processing, including when each fits best in a pipeline.

Stream ProcessingETLBatch Processing

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Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosis

Cgi Nederland