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Updated weekly · Last refresh Sep 25

Zillow Data Engineer Interview Questions

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

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1
CodingStart here. 8 questions · ~78 min
First Non-Repeating CharacterEasy
Practice

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingZillow
Whiteboard Python and Data QuestionsMedium

Evaluates your problem-solving process for Python and data-focused questions under time pressure.

pythonZillow
Array-Based Coding ProblemsMedium

Assesses your proficiency with core array algorithms and your ability to choose the right technique.

ArraysZillow
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2
Pipelines11 questions · ~107 min
Optimize Skewed Spark JoinMedium

Optimize a Spark join where skewed keys create long-running tasks during a transaction to merchant metadata enrichment step.

JoinsperformancesparkZillow
Handle Late Data in BatchMedium

Approach for handling late-arriving records in a batch ETL pipeline without breaking correctness or forcing full reloads.

Batch ProcessingIdempotencyDependenciesZillow
Backfill While Preserving Real TimeHard

Approach for running large historical backfills without breaking real-time pipeline freshness or correctness.

Stream ProcessingDependenciesBackfillingZillow
Monitor a Mission Critical PipelineMedium

Design a monitoring and alerting approach for a mission critical pipeline, covering system health, data quality, and operational response.

InfrastructureToolsQualityZillow
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3
Behavioral & Leadership5 questions · ~49 min
Owning a High-Stakes Production BugEasy

Tests ownership in debugging, structured root-cause analysis, and clear communication during a production issue.

CommunicationOwnershipZillow
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The finish line: interview-readyComplete all 24 questions to finish this plan.