Top 50
Prep plan
Updated weekly · Last refresh Aug 30

Circle Software Engineer Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 22 questions · ~237 min
Print RectangleEasy
Practice

Build a hollow ASCII rectangle for a Circle status display using boundary checks and string construction.

geometryCircle
Closest Past Departure TimeEasy
Practice

Convert Circle payout times to minutes and find the smallest elapsed time since the latest completed payout.

SchedulingCircle
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2
Execution5 questions · ~54 min
Consistent High-Concurrency LedgerHard

Tests ability to design a consistent, audit-ready ledger under heavy concurrent writes.

design systemconsistencydata integrityCircle
Express Error Handling and RollbacksMedium

Tests backend reliability skills for consistency, retries, and transactional failure handling.

Rollback PlanTechnical FluencytransactionsCircle
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3
SQL & Data Manipulation4 questions + 3 drills · ~73 min
Cross-Partner Transaction ReconciliationHard

Tests data reconciliation design, correctness, and operational handling of mismatches across systems.

JoinsReconciliationdata integrityCircle
SQL Schema for Nested Payment DataHard

Tests database design skills for nested structures and performance under heavy transactional load.

Performance TuningsqlData ModelingCircle
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Top-Performing Products QueryMedium
Practice
Practice drill

Rank Tesco products by Q2 revenue using a date-filtered join, aggregation, and RANK window function.

sqlperformance analysisTTesco
Write a Query for Repeated RowsMedium
Practice
Practice drill

Find repeated Zomato order items using GROUP BY, HAVING, a CTE, and STRING_AGG.

sqldata integrityZomato
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4
System Design12 questions · ~129 min
Flight Booking System DesignHard

Evaluates your system design skills for a booking workflow with correctness and scalability.

booking systemuser experienceCircle
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5
Behavioral & Leadership6 questions · ~65 min
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6
More topics1 question · ~11 min
Real-Time Blockchain Event IngestionHard

Tests system design for event streaming pipelines across multiple blockchain sources.

data integrationStream ProcessingOrchestrationCircle
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.