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Updated weekly · Last refresh Oct 17

United Airlines Data Engineer Interview Questions

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

12questions
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1
PipelinesStart here. 4 questions · ~36 min
Cloud Storage in Data PipelinesEasy

Discuss how cloud storage fits into ETL pipelines, including staging, data quality, and operational monitoring.

InfrastructureETLUnited Airlines
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLUnited Airlines
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityUnited Airlines
Consistent ETL Across SystemsMedium

Tests your ETL design skills for maintaining consistency across multiple United Airlines data sources.

data integrationETLdata consistencyUnited Airlines
2
Behavioral & Leadership6 questions · ~54 min
Aligning Team Work to MissionEasy

Tests whether you can translate company mission into team priorities, communicate trade-offs, and maintain execution focus.

Stakeholder ManagementCommunicationLeadershipUnited Airlines
Owning a High-Stakes Production FailureMedium

Tests ownership during a difficult production issue, including troubleshooting, communication, and measurable reliability impact.

impactOwnershipstarUnited Airlines
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3
More topics2 questions · ~18 min
SQL Grouping and RankingEasy
Practice

Find the second-highest distinct salary at United Airlines using GROUP BY, COUNT, and ordered aggregation.

aggregationsqlUnited Airlines
Optimizing Distributed Query PerformanceHard

Tests your ability to improve SQL performance at scale using distributed systems techniques.

performancequery optimizationUnited Airlines

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Rolling 7-Day Average QueryMedium
Practice
Practice drill

Calculate Deliveroo's daily order volume and rolling 7-day average using a date spine, aggregation, and window functions.

sql queryKoch Minerals & TradingDeliverooLLSEG (London Stock Exchange Group)
The finish line: interview-readyComplete all 12 questions plus 2 hands-on drills to finish this plan.