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Qci Interview Questions

The questions to prepare for Qci interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 11 questions · ~104 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsQci
DP with MemoizationMedium
Practice

Compute the nth Fibonacci number recursively, then optimize overlapping subproblems with memoization.

Recursioncoding challengeDynamic ProgrammingQci
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2
Technical Fundamentals4 questions · ~38 min
Frontend Performance with CSSMedium

Tests understanding of frontend performance tradeoffs and responsive design fundamentals.

performanceresponsive designQci
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3
Behavioral & Leadership17 questions · ~161 min
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4
More topics5 questions · ~47 min
MVC in Modern FrameworksMedium

Tests ability to explain core architecture and map MVC concepts to real framework implementations.

expressspring bootQci
SQL Joins and IndexesMedium

Tests SQL join semantics and performance tuning concepts using indexes.

JoinsperformanceindexesQci
Serialization over gRPC/RESTMedium

Tests API data modeling, transport formats, and correctness considerations across service boundaries.

rest apisQci
New Board Bring-Up TestingMedium

Evaluates your approach to initial hardware validation and safe, structured bring-up.

TestingQci
Most Complex ArchitectureHard

Tests system design depth, tradeoffs, and ability to deliver complex architectures end to end.

solution designtechnical deptharchitectureQci

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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