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Zillow Data Scientist Interview Questions

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

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1
MetricsStart here. 4 questions · ~32 min
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 IndicatorsDiagnosisZillow
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2
SQL & Data Manipulation3 questions + 3 drills · ~54 min
LEFT JOIN NULL HandlingMedium

Tests your ability to reason about SQL join semantics and their effect on aggregates.

null handlingJoinsAggregationsZillow
Weekly Service KPI by TeamMedium
Practice
Practice drill

Analyze weekly service delivery performance by team using joins, a CTE, date aggregation, and KPI calculations.

KPIJoinssqlDeloitteReputation
Identify Funnel Bottlenecks in OnboardingHard
Practice
Practice drill

Use joins, CTEs, and aggregations to find the weakest step in an onboarding funnel and estimate lost conversions.

Funnel AnalysissqlDiagnosisAtlassianRevolut
SQL Ranking by SalaryEasy
Practice
Practice drill

Join employee and salary data, then rank employees within each Intuit product company using a PostgreSQL window function.

JoinssqlAggregationsIntuit
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3
Machine Learning4 questions · ~32 min
Random Forest Feature ImportanceMedium

Tests your understanding of model interpretability methods and their failure modes.

Ensemble MethodsFeature EngineeringModel EvaluationZillow
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4
Behavioral & Leadership11 questions · ~88 min
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5
More topics6 questions · ~48 min
A/B Test for Search RankingHard

Tests your experimental design skills for ranking changes, including metrics and validity checks.

experiment designGuardrail Metricsprimary metricsZillow
Statistical Significance for Search ChangesMedium

Tests your ability to choose and apply appropriate statistical tests for Zillow search result changes.

Hypothesis TestingStatistical SignificanceP-ValuesZillow
Executive-Friendly Housing TrendsEasy

Tests your ability to communicate data insights clearly to executive audiences.

MetricsCommunicationuser valueZillow
Measure Success of Search FilterMedium

Tests your ability to define metrics and evaluation plans for Zillow product experiments.

MetricsUser NeedsUse CasesZillow
Pitfalls in Zillow ExperimentsHard

Tests your ability to anticipate and mitigate common threats to experiment validity.

Network InterferenceNovelty EffectSample Ratio MismatchZillow
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