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Updated weekly · Last refresh Aug 30

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 weekly.

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1
A/B Testing & ExperimentationStart here. 3 questions · ~26 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchCgi Nederland
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2
Machine Learning5 questions · ~43 min
Choose the Right ML ModelMedium

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

Ensemble MethodsSupervised LearningDecision TreesCgi Nederland
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3
Statistics & Probability5 questions · ~43 min
Significant Result, Small Business ImpactMedium

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

Confidence IntervalsStatistical SignificanceA/B TestingCgi Nederland
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4
Behavioral & Leadership10 questions · ~85 min
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5
More topics8 questions · ~68 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 TotalsCgi Nederland
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 IndicatorsDiagnosisCgi 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 valueCgi Nederland
Choose Metrics for Imbalanced DataMedium

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

F1 ScorePrecisionAUC-ROCCgi Nederland
Batch vs Streaming Data ProcessingEasy

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

Stream ProcessingETLBatch ProcessingCgi Nederland
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Top 5 Products Per MonthMedium
Practice
Practice drill

Rank completed product sales by month using joins, aggregation, date truncation, and ROW_NUMBER().

sqlCGICgi NederlandCGI Group
Top Customers by Region VolumeMedium
Practice
Practice drill

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankNavi
The finish line: interview-readyComplete all 31 questions plus 2 hands-on drills to finish this plan.