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Extern Software Engineer Interview Questions

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

21questions
~3htotal time
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1
CodingStart here. 6 questions · ~59 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsExtern
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysExtern
Compare REST and SOAP APIsMedium

Explain the core differences between REST and SOAP, including message format, protocol style, and trade-offs.

Hash TablesStringsExtern
Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingExtern
Performance OptimizationMedium

Tests ability to identify bottlenecks and improve runtime or space efficiency.

Hash TablesArraysExtern
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2
Behavioral & Leadership13 questions · ~129 min
Resolving a High-Stakes Technical ChallengeEasy

Tests ownership in solving a technical challenge under ambiguity, including prioritization, communication, and measurable execution.

CommunicationOwnershipDealing With AmbiguityExtern
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3
More topics2 questions · ~20 min
Improve System Performance and ReliabilityEasy

Explain how you would optimize a system for performance, reliability, and user experience while making clear trade-offs and defining success.

Trade-offsSuccess CriteriaRisk AssessmentExtern
Version Control in TeamsEasy

Tests your engineering practices for safe collaboration and change management.

DependenciesScope ManagementExtern

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