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Updated weekly · Last refresh Aug 30

Itlize Global Data Scientist Interview Questions

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

36questions
~5htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 1 drill · ~46 min
2
Machine Learning5 questions · ~44 min
Prevent Overfitting in ML ModelsEasy

Explain how to reduce overfitting using regularization, validation, and model selection.

Cross-ValidationBias-Variance TradeoffRegularizationItlize Global
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3
Metrics5 questions · ~44 min
Analyze a Successful CampaignEasy

Describe how you would evaluate a successful marketing campaign using funnel KPIs, conversion, and ROI.

KPIsDiagnosisEngagement MetricsItlize Global
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4
Statistics & Probability4 questions · ~36 min
Statistical Significance and Confidence IntervalsEasy

Explain how statistical significance and confidence intervals are interpreted in a product experiment.

Confidence IntervalsHypothesis TestingStatistical SignificanceItlize Global
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5
A/B Testing & Experimentation4 questions · ~36 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 MismatchItlize Global
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6
Behavioral & Leadership9 questions · ~80 min
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7
More topics5 questions · ~44 min
Design a Cold Start RankerMedium

Design a recommendation and ranking system that handles cold start for both new users and new items without hurting feed quality.

Cold StartTwo-Tower ModelsRecommendation SystemsItlize Global
Prioritize Features for a New ProductMedium

A framework for deciding which features should ship first when building a new product.

Feature PrioritizationUser Needsproduct developmentItlize Global
Optimizing Performance for Large DatasetsMedium

Tests your approach to scaling data processing and improving runtime efficiency.

InfrastructureBatch ProcessingData ModelingItlize Global
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The finish line: interview-readyComplete all 36 questions plus 1 hands-on drill to finish this plan.