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Prep plan
Updated weekly · Last refresh Oct 17

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 daily.

50questions
~8htotal time
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1
CodingStart here. 20 questions · ~202 min
Implement Hangman With Limited GuessesMedium
Practice

Simulate Hangman guesses, track repeated letters, stop at the guess limit, and return the final game status and pattern.

Data StructuresAlgorithmsedge casesCircle Internet Financial
Develop a Transactions REST APIHard
Practice

Process sequential transfers with validation, atomic balance updates, and idempotency using hash maps.

apiData StructurestransactionsCircle Internet Financial
Spring MVC API ImplementationHard
Practice

Order and deduplicate Spring MVC API design requirements while excluding JAX-RS usage.

Codingclean codeapiCircle Internet Financial
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2
System Design19 questions · ~192 min
Design an API and Ticket ReservationHard

Design an ML-assisted ticket reservation system with reliable availability, ranking, hold management, and transactional booking.

ML Rankingsystem designlatencyCircle Internet Financial
Design a Payment System Like VenmoHard

Design an ML-powered payment system like Venmo with real-time risk scoring, authorization, and reliable fallback behavior.

system designapi designdistributed systemsCircle Internet Financial
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3
Execution5 questions · ~50 min
Your Research InterestsEasy

Tests how your interests align with Clemson University research directions and potential collaborations.

User NeedsScope ManagementProduct VisionCircle Internet Financial
Scaling With ACID ComplianceHard

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

scalingCircle Internet Financial
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4
Behavioral & Leadership5 questions · ~50 min
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5
More topics1 question · ~10 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
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.