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Updated weekly · Last refresh Sep 22

Software Technology Data Scientist Interview Questions

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

33questions
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1
Machine LearningStart here. 10 questions · ~81 min
Bias Variance Tradeoff BasicsEasy

Explain how bias and variance affect generalization, and how model complexity changes the balance.

Cross-ValidationBias-Variance TradeoffSupervised LearningSoftware Technology
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2
Statistics & Probability3 questions · ~24 min
Statistical Significance in Hypothesis TestingEasy

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceSoftware Technology
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3
Behavioral & Leadership10 questions · ~81 min
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4
More topics10 questions · ~81 min
Evaluate Imbalanced Model PerformanceMedium

Evaluate a model on an imbalanced dataset and judge whether accuracy is misleading.

F1 ScorePrecisionRecallSoftware Technology
Cleaning Missing Values in PipelinesEasy

Approach for handling missing values in a pipeline with data quality checks and repeatable transformations.

Data WranglingETLQualitySoftware Technology
First Checks for Metric DropsEasy

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

Lagging IndicatorsLeading IndicatorsDiagnosisSoftware Technology
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 TestingSoftware Technology
Root Cause Analysis for LatencyMedium

Tests your data-driven approach to isolating and diagnosing performance bottlenecks.

Data AnalysisSoftware Technology
Investigating Engagement Metric DropsMedium

Assesses your troubleshooting workflow for product metric anomalies and likely data issues.

root cause analysisuser engagementSoftware Technology
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL: Top Engaged Save InteractorsMedium
Practice
Practice drill

Use joins, aggregation, a CTE, and ROW_NUMBER to rank Instagram Save users by quarterly engagement within each region.

sql queryData Analysisuser engagementMeta
SQL Funnel Drop-Off AnalysisHard
Practice
Practice drill

Measure sequential Airbnb Homes funnel engagement and drop-off using CTEs, joins, aggregation, and LAG.

sql queryData Analysisuser engagementAirbnbGGetYourGuide
Top 5 Shows by RegionMedium
Practice
Practice drill

Aggregate watch minutes and rank the five most-watched shows within each region.

Data Manipulationsql queryData AnalysisDDisney+HotStar
The finish line: interview-readyComplete all 33 questions plus 3 hands-on drills to finish this plan.