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Cotality Software Engineer Interview Questions

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

50questions
~9htotal time
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1
SQL & Data ManipulationStart here. 11 questions · ~115 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCotality
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 · ~168 min
First Non-Repeating CharacterEasy
Practice

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingCotality
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
Execution10 questions · ~105 min
Ensure Distributed Data ConsistencyHard

Define an execution approach for maintaining data consistency across distributed systems while balancing delivery speed, risk, and operational resilience.

InfrastructureTrade-offsRisk AssessmentCotality
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4
Pipelines4 questions · ~42 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 & Infrastructure3 questions · ~31 min
JWT for AuthenticationMedium

Evaluates your security fundamentals for modern API authentication.

authenticationjwtCotality
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6
Behavioral & Leadership4 questions · ~42 min
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7
More topics2 questions · ~21 min
API Rate Limiter DesignHard

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

api designperformanceCotality
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