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Updated weekly · Last refresh Aug 30

Costco Wholesale Software Engineer Interview Questions

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

22questions
~3htotal time
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1
CodingStart here. 5 questions · ~40 min
String Anagram Check and TestingMedium

Evaluates algorithm correctness and test design for edge cases.

string manipulationCostco Wholesale
Coding Challenges OverviewHard

Evaluates performance under mixed-format assessments and problem-solving stamina.

Costco Wholesale
Algorithm Practice and SolutionsMedium

Tests clarity of implementation and approach under timed problem solving.

Problem SolvingAlgorithmsCostco Wholesale
Debug and Fix Provided CodeMedium

Evaluates debugging approach and ability to reason about code changes.

code analysisDebuggingCostco Wholesale
Java Fundamentals and QAMedium

Evaluates readiness in Java fundamentals and testing concepts.

Costco Wholesale
2
Behavioral & Leadership15 questions · ~120 min
Resolving Conflict With a ColleagueEasy
Recently asked

Tests conflict resolution in a sales context, including communication, influence, and preserving internal alignment around an account.

Conflict ResolutionCommunicationDealing With AmbiguityCostco Wholesale
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3
More topics2 questions · ~16 min
CI/CD and Its BenefitsMedium

Assesses understanding of CI/CD and its impact on delivery and team workflows.

CI/CDCostco Wholesale
SQL Basics for Data WorkEasy

Assesses SQL fundamentals and ability to reason about query outputs.

javasql queriesCostco Wholesale

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Basic SQL and String ReverseEasy
Practice
Practice drill

Reverse Costar property search strings with PostgreSQL and flag rows whose stored expected value does not match.

sql queriesstring manipulationCostar
SQL: Character CountEasy
Practice
Practice drill

Count a target character case-insensitively in a Discord message using PostgreSQL string functions.

Data Analysissql queriesstring manipulationDiscord
SQL: Unique Words Between MessagesMedium
Practice
Practice drill

Use PostgreSQL string splitting, CTEs, joins, and window functions to find words unique to two Discord messages.

Data Analysissql queriesstring manipulationDiscord
The finish line: interview-readyComplete all 22 questions plus 3 hands-on drills to finish this plan.