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Updated weekly · Last refresh Aug 30

United Airlines Software Engineer Interview Questions

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

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1
CodingStart here. 14 questions · ~118 min
Reverse a Linked ListEasy
Practice

Reverse a singly linked list in place using pointer manipulation.

RecursionLinked ListsUnited Airlines
Detect and Remove Linked List LoopMedium
Recently asked

Tests linked list fundamentals and ability to implement correct cycle detection and repair.

Basic AlgorithmsLinked ListsdfsUnited Airlines
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2
SQL & Data Manipulation4 questions + 3 drills · ~64 min
Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

United Airlines
Explain ACID in Transaction SystemsEasy
Recently asked

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityUnited Airlines
Advanced SQL for OperationsHard
Recently asked

Tests ability to write advanced SQL for operational analytics and performance-aware querying.

Window FunctionsJoinsAggregationsUnited Airlines
SQL Grouping and RankingEasy
Practice
Practice drill

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

aggregationsqlUnited Airlines
Second Highest Trader SalaryEasy
Practice
Recently asked
Practice drill

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

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
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3
Execution5 questions · ~42 min
Distributed Cache and InvalidationMedium
Recently asked

Tests caching concepts and strategies to maintain correctness under high load.

Trade-offsperformancecachingUnited Airlines
Secure Async MicroservicesHard
Recently asked

Tests distributed systems design and security considerations for async service communication.

Technical FluencyCloud Security RisksmicroservicesUnited Airlines
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4
Behavioral & Leadership25 questions · ~211 min
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5
More topics1 question · ~8 min
ELK Stack for Live MonitoringMedium
Recently asked

Tests observability architecture knowledge and practical monitoring workflows.

monitoringToolsobservabilityUnited Airlines
The finish line: interview-readyComplete all 49 questions plus 3 hands-on drills to finish this plan.