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Zalando Data Scientist Interview Questions

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

Landing Page Conversion Test DesignMedium

Design a landing-page A/B test with clear metrics, power, and significance criteria while guarding against common experiment pitfalls.

Statistical SignificanceSample SizeA/B Testing
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Common Pitfalls in Experiment Results
Hard

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

PeekingNovelty EffectSample Ratio Mismatch
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Balance Conversion and RetentionHard

Framework for deciding when to favor short-term conversion gains versus long-term retention in a product decision.

Feature PrioritizationUser NeedsValue Proposition
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Checkout UI Impact Evaluation
Medium

Tests your ability to design and interpret product experiments for conversion outcomes.

user experience
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Handling Missing and Dirty SQL Data
Medium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQuality
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Engagement Over Time Metric
Medium

Evaluates your metric design for longitudinal user behavior measurement.

user engagement
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Validate Statistical Model Results
Medium

Assesses how you verify model reliability and robustness.

Data Analysismodel validation
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Explain Logistic Regression
Easy

Tests foundational knowledge of classification models and their assumptions.

RegularizationRegressionSupervised Learning
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