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Updated weekly · Last refresh Oct 17

Opendoor Data Engineer Interview Questions

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

15questions
~2htotal time
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1
CodingStart here. 4 questions · ~37 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersOpendoor
Handling Coding Interview PressureMedium

Assesses how you manage stress and still deliver correct, maintainable code under pressure.

CodingOpendoor
Most Efficient Sorting AlgorithmEasy

Tests your knowledge of algorithmic efficiency and time complexity for comparison-based sorting.

MathArraysSortingOpendoor
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2
Pipelines9 questions · ~83 min
Describe a Complex Transformation PipelineMedium

Explain a complex ETL transformation you built, including the main challenges and how you handled them.

ETLData ModelingQualityOpendoor
Handle Incomplete Pipeline DataMedium

Approach for handling missing, inconsistent, and duplicate data in a pipeline without breaking downstream analytics.

Data WranglingETLQualityOpendoor
Diagnose an Integration Pipeline IssueMedium

Structured approach to diagnose failures in an ETL integration, from source extraction through orchestration, data quality, and idempotent recovery.

ToolsDependenciesQualityOpendoor
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3
More topics2 questions · ~19 min
SQL vs NoSQL for Go-to-Market DataEasy

Explain how SQL and NoSQL differ in schema, consistency, scaling, and Demandbase-style analytics use cases.

JoinsData WranglingOpendoor
Handle Missing ValuesEasy

Tests data quality judgment and appropriate imputation or exclusion strategies for analytics.

Data WranglingCase WhenAggregationsOpendoor
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Handling Missing DataEasy
Practice
Practice drill

Replace missing sales fields with defined defaults and return a consistently ordered dataset.

missing valuesdata cleaningnull handlingUniversity of MinnesotaThe Home DepotNationwide
Top 10 Cities by Avg PriceEasy
Practice
Practice drill

Use joins and aggregation to return the 10 cities with the highest average home price.

JoinsRankingGroup ByOpendoor
Top 10 Cities With TiesMedium
Practice
Practice drill

Use aggregation and ranking to return the top 10 cities by average home price, including ties.

null handlingRankingGroup ByOpendoor
The finish line: interview-readyComplete all 15 questions plus 3 hands-on drills to finish this plan.