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Circle Internet Financial Software Engineer Interview Questions

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

50questions
~7htotal time
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1
ExecutionStart here. 5 questions · ~40 min
Scaling With ACID ComplianceHard

Tests ability to balance ACID guarantees with scalability, latency, and distributed transaction constraints.

scalingCircle Internet Financial
Debugging Production MicroservicesMedium

Tests incident response, observability, and structured troubleshooting in distributed systems.

production issuesDebuggingmicroservicesCircle Internet Financial
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2
System Design19 questions · ~152 min
Digital Wallet Real-Time UpdatesHard

Tests system design for low-latency updates, consistency, and scalability for wallet balance changes.

system designreal-time updatesdigital walletCircle Internet Financial
Ensuring Data ConsistencyMedium

Tests understanding of consistency models, replication, and correctness in distributed architectures.

distributed systemsdata consistencyCircle Internet Financial
Design High-Concurrency TransactionsHard

Tests system design skills for throughput, correctness, and performance under heavy transaction load.

system designCircle Internet Financial
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3
Coding20 questions · ~160 min
Arrays and Matrix Coding PracticeMedium

Tests algorithmic problem-solving with common array and matrix patterns.

ArraysMatrixCircle Internet Financial
Implement Hangman With Limited GuessesMedium

Tests ability to implement game rules and manage state transitions correctly.

implementationCircle Internet Financial
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4
Behavioral & Leadership5 questions · ~40 min
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5
More topics1 question · ~8 min
SQL Join FundamentalsEasy

Tests understanding of SQL joins and relational query composition.

JoinssqlCircle Internet Financial
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Duplicate DetectionEasy
Practice
Practice drill

Find duplicate customer profiles by grouping on identifying fields and returning only repeated records.

Group ByHavingAggregationsAdtalem Global EducationAmerisave MortgageCitrine Informatics
SQL Average Selling PriceMedium
Practice
Practice drill

Calculate weighted average selling prices by product using a date-range join, aggregation, and NULL handling.

leetcodesqlCostarCostar Group
Top Earners via Table JoinMedium
Practice
Practice drill

Rank Motorola Solutions employees by total earnings using a LEFT JOIN, aggregation, COALESCE, and ROW_NUMBER.

JoinssqlMotorola SolutionsMotorola
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.