CarGurus Software Engineer Interview Questions

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

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CodingStart here. 11 questions · ~136 min

Implement an LRU CacheHard

Practice

Implement an LRU cache with O(1) get and put operations using a hash map and doubly linked list.

cachingData Structurescache

CarGurus

Average of Streamed MetricsMedium

Practice

Aggregate streamed metric values by name and source using a hash map of running totals and counts.

aggregationData StructuresAlgorithms

CarGurus

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SQL & Data Manipulation10 questions · ~123 min

Count Entity Relationships Including Zero MatchesMedium

Practice

Model normalized scenario entities and report each entity's relationship count.

data relationshipsJoinsdatabase design

CarGurus

SQL Grouping With ConditionsMedium

Practice

Calculate average qualifying listing marks for each CarGurus dealer group using a join, filtering, grouping, and HAVING.

sql

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System Design10 questions · ~123 min

Design a Code Freeze Scheduling ServiceHard

Design a reliable service for creating, validating, and communicating code freeze schedules.

system designdistributed systemsdesign

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Security & Infrastructure4 questions · ~49 min

Blue-Green and Canary DeploymentsHard

Compare blue/green and canary releases, including traffic control, security risks, observability, and rollback decisions.

best practiceskubernetesapplication security

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Execution11 questions · ~136 min

Influencing a Product Design DecisionMedium

Describe how you influenced a cross-functional design decision without direct authority, balancing stakeholder needs and practical trade-offs.

Trade-offsSuccess CriteriaScope Management

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Behavioral & Leadership3 questions · ~37 min

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