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Updated weekly · Last refresh Oct 17

CodeSignal Software Engineer Interview Questions

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

47questions
~7htotal time
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1
CodingStart here. 28 questions · ~244 min
Optimize String Pattern AnalysisMedium
Practice

Find the longest substring without repeated characters using a sliding window and last-seen index map.

time complexityStringsData StructuresCodeSignal
Debug Edge-Case FailuresMedium

Tests systematic debugging and correctness under tricky inputs.

Problem SolvingDebuggingedge casesCodeSignal
Develop Mock Banking SystemMedium

Evaluates your approach to designing and implementing a small domain model in code.

system designCodeSignal
Sort Linked List 0-1-2Medium

Tests ability to implement correct in-place linked list sorting logic.

CodeSignal
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2
System Design3 questions · ~26 min
Design Keystroke TrackingHard

Evaluates system design skills for capturing and processing user input at scale.

designCodeSignal
System Design Around Business ModelMedium

Assesses your ability to connect system design choices to product and operational needs.

system designData StructuresCodeSignal
Design File Metadata ClassMedium

Assesses your object-oriented design skills for a constrained system.

CodeSignal

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3
Behavioral & Leadership16 questions · ~139 min
Lead Most Complex ProjectHard

Tests technical leadership, ownership, prioritization, and execution through ambiguity.

achievementproject leadershipaccountabilityCodeSignal
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