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RoundCircle Interview Questions

The questions to prepare for RoundCircle interviews, across all roles. 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
Memory Management in Apps
Medium

Tests understanding of memory usage, performance implications, and potential leaks.

Linked ListsArrays
RoundCircle
Optimizing Search in Large Datasets
Medium

Tests your understanding of indexing, query optimization, and performance tradeoffs.

Hash TablesArraysSearching
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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
Concurrency in Multi-Threading
Hard

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

system designconcurrency
RoundCircle
High Availability for Distributed Systems
Hard

Tests design choices for redundancy, failover, and resilience in production distributed services.

distributed systemshigh availabilityarchitecture
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Debugging Production Issues
Medium

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

production issuesDebugging
RoundCircle
Indexing and Database Performance
Medium

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

indexingsql
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