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Costar Group Software Engineer Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 10 questions · ~87 min
Check Anagrams FunctionEasy
Practice
Recently asked

Determine whether two CoStar listing tokens are anagrams using character frequency counts in linear time.

function implementationStringsCostar Group
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2
SQL & Data Manipulation10 questions + 2 drills · ~107 min
SQL Average Selling PriceMedium
Practice
Recently asked

Calculate weighted average selling prices by product using a date-range join, aggregation, and NULL handling.

leetcodesqlCostar Group
Optimize a Slow SQL QueryHard
Practice
Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingAmeripriseEEltro Cyberchrome PrivateEnergyHub
Calculate Monthly Sales Growth by Product CategoryMedium
Practice
Recently asked
Practice drill

Calculate month-over-month sales growth for each product category using JOINs and window functions.

JoinsAggregationsWayfairREVOLVEFanatics
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3
Execution10 questions · ~87 min
Evaluate Engineering Decision Trade-offsMedium
Recently asked

Explain how you weigh speed, quality, risk, and stakeholder needs when making engineering decisions on a meaningful initiative.

Trade-offsRisk AssessmentScope ManagementCostar Group
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4
System Design9 questions · ~78 min
System Design: Component CommunicationMedium
Recently asked

Tests front-end architecture thinking and state management patterns for component communication.

reactCostar Group
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5
Security & Infrastructure5 questions · ~44 min
Debugging Production IssuesHard
Recently asked

Tests incident debugging approach, evidence gathering, and risk-aware troubleshooting.

root cause analysisproduction issuesDebuggingCostar Group
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6
More topics6 questions · ~52 min
Object-Oriented Problem SolvingMedium
Recently asked

Evaluates OOP reasoning and structured problem-solving during technical discussions.

Problem SolvingoopCostar Group
Redis Caching StrategyMedium
Recently asked

Assesses practical caching design to improve performance and reduce database pressure.

cachingCostar Group
Re-Architecting for New RequirementsMedium
Recently asked

Evaluates system thinking and ability to evolve architectures as requirements change.

requirementsCostar Group
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.