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RoundCircle Software Engineer Interview Questions

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

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Time Complexity of Sorting AlgorithmsEasy

Compare common sorting algorithms by best, average, and worst-case time complexity and explain when each is appropriate.

MathArraysSorting
RoundCircle
Cycle Detection or Reversal
Medium

Assesses linked list manipulation skills and ability to choose correct algorithms.

Linked Listscycle detection
RoundCircle
Implement Stack or Queue
Medium

Tests ability to implement core data structures and reason about time and space complexity.

StackQueueData Structures
RoundCircle
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Design a URL Shortening ServiceHard

Design a URL shortening service that routes, ranks, and monitors links at scale.

Feature StoreModel Serving
RoundCircle
Web Request-Response Lifecycle
Medium

Tests understanding of HTTP flow and how web requests are processed end to end.

lifecycle
RoundCircle
Concurrency in Multi-Threading
Hard

Tests ability to prevent race conditions, manage synchronization, and reason about thread safety.

system designconcurrency
RoundCircle
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Indexing and Database Performance
Medium

Evaluates how indexing impacts query speed, storage, and write performance.

indexingsql
RoundCircle
Debugging Production Issues
Medium

Tests incident triage, hypothesis-driven debugging, and safe mitigation in live systems.

production issuesDebugging
RoundCircle
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