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Top 36
Prep plan
Updated weekly · Last refresh Oct 17

Qci Software Engineer Interview Questions

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

36questions
~6htotal time
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1
CodingStart here. 11 questions · ~105 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
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonQci
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2
Technical Fundamentals4 questions · ~38 min
REST vs GraphQLMedium

Tests API design tradeoffs and ability to choose the right approach for client needs.

rest apissolution designQci
UART vs SPI ProtocolsMedium

Tests understanding of low-level communication protocols and their practical engineering differences.

hardware integrationtechnical experiencecommunication protocolsQci
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3
Behavioral & Leadership16 questions · ~152 min
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4
More topics5 questions · ~48 min
New Board Bring-Up TestingMedium

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

TestingQci
Serialization over gRPC/RESTMedium

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

rest apisQci
Most Complex ArchitectureHard

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

solution designtechnical deptharchitectureQci
SQL Joins and IndexesMedium

Tests SQL join semantics and performance tuning concepts using indexes.

JoinsperformanceindexesQci
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Troubleshooting Data Integration IssuesMedium
Practice
Practice drill

Reconcile records from two systems and classify missing records, amount differences, and status discrepancies.

data integrationnull handlingJoinsAutodesk
Refactoring a Slow QueryMedium
Practice
Practice drill

Refactor a slow Candid Health claims query using pre-aggregation, latest-event logic, and monthly payer metrics.

Performance Tuningdatabase optimizationCTEsCandid Health
Automate with Your Programming LanguageMedium
Practice
Practice drill

Count Citi workflow task types with more than one exception and show the latest review date.

Data ManipulationAutomationtechnical experienceCiti
The finish line: interview-readyComplete all 36 questions plus 3 hands-on drills to finish this plan.