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Updated weekly · Last refresh Aug 30

Square Software Engineer Interview Questions

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

41questions
~6htotal time
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1
CodingStart here. 20 questions · ~162 min
Matrix Grid Search AlgorithmMedium

Tests algorithmic problem solving with grid representations and boundary conditions.

Array ManipulationMatrixtraversalSquare
Rate Limiter for API ProtectionMedium

Tests practical implementation of throttling logic and safe handling of bursts.

Hash Tablescachingperformance analysisSquare
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2
Execution5 questions · ~40 min
Low-Latency Trading PlatformHard

Tests system design for low latency, strong consistency, and auditability requirements.

Trade-offsSuccess CriteriaRisk AssessmentSquare
Concurrent Hotel Booking SystemHard

Tests concurrency control and correctness in booking workflows under race conditions.

Trade-offsRoadmappingScope ManagementSquare
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3
System Design3 questions · ~24 min
API Endpoints for ArchitectureMedium

Assesses your ability to translate requirements into practical API design.

api designarchitectureSquare
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4
Behavioral & Leadership10 questions · ~81 min
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5
More topics3 questions · ~24 min
Scale Notification ServiceHard

Tests distributed systems design for high-volume messaging, reliability, and delivery guarantees.

Stream ProcessingmonitoringOrchestrationSquare
Manage Certificates in GreenfieldMedium

Assesses your security and infrastructure thinking for certificate lifecycle management.

Square
Stream Aggregation by DateMedium

Assesses your ability to design and implement efficient stream aggregation logic.

Square

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
7-Day Rolling DAU on FacebookMedium
Practice
Practice drill

Compute daily distinct active users and a 7-day rolling average using a CTE and window function.

ActivisionStripePyramid Consulting
SQL Query for Top ProductsMedium
Practice
Practice drill

Rank Natural Intelligence products by completed revenue in the last completed quarter using joins, aggregation, and a date CTE.

sql queryperformance analysisNatural Intelligence
Top Ad Campaigns by ConversionMedium
Practice
Practice drill

Rank InMobi Exchange campaigns by conversion rate using joins, aggregation, a CTE, and deterministic ordering.

sql queryperformance analysisInMobi
The finish line: interview-readyComplete all 41 questions plus 3 hands-on drills to finish this plan.