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Prep plan
Updated weekly · Last refresh Oct 17

Cotality Software Engineer Interview Questions

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

50questions
~10htotal time
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1
SQL & Data ManipulationStart here. 11 questions · ~126 min
SQL Join and AggregationEasy
Practice

Use a LEFT JOIN and COUNT aggregation to report each Cotality Knowledge Library author's book count, including authors with none.

aggregationCotality
Top 3 Per Category SQLEasy
Practice

Use ROW_NUMBER and joins to find the three highest-valued active properties in each Cotality Property Insights category.

Window FunctionsRankingGroup ByCotality
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2
Coding16 questions · ~183 min
Implement Set Without Built-insMedium
Practice

Implement a custom hash set that removes duplicates while preserving first-seen order, without using Python set or dictionary types.

deduplicationData StructuresAlgorithmsCotality
Palindrome Detection CodingEasy
Practice

Use two pointers to verify whether a test identifier reads the same forward and backward after normalization.

StringsTwo PointersCotality
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3
Execution9 questions · ~103 min
Choose Refactor or Ship FeaturesMedium

Decide when to invest in refactoring versus shipping new features while balancing delivery, risk, and stakeholder expectations.

Trade-offsRoadmappingPrioritizationCotality
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4
Pipelines4 questions · ~46 min
Backfilling Missing Pipeline DataMedium

Approach for safely backfilling missing data while preserving correctness, idempotency, and data quality.

ETLQualityCotality
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5
Security & Infrastructure4 questions · ~46 min
Web Hosting OptionsMedium

Assesses your infrastructure understanding and ability to reason about deployment options.

NetworkingCotality
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6
Behavioral & Leadership4 questions · ~46 min
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7
More topics2 questions · ~23 min
API Rate Limiter DesignHard

Evaluates your system design skills for protecting Persistent Systems APIs under load.

api designperformanceCotality
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