Costar QA Engineer Interview Questions

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

24questions

~4htotal time

Track your progressSign up free to work through all 24 questions and resume where you left off.

SQL & Data ManipulationStart here. 7 questions + 1 drill · ~73 min

Evaluates SQL join proficiency and your ability to use data queries for defect investigation.

SQL and QA Knowledge FitMedium

Evaluates your ability to connect SQL skills with practical QA testing and validation.

sql

Costar

Second-Highest Price Without LIMITMedium

Practice

Find the second-highest distinct property price without using LIMIT.

SubqueriesRankingdatabase querying

Costar

Find Duplicate RecordsMedium

Practice

Find duplicate PenFed application records using a windowed count over business-key columns.

sql querydata integrity

Costar

Test Failed Database TransactionsMedium

Tests understanding of transactional behavior and QA strategies for failure scenarios.

acid propertiesnull handlingtransactions

Costar

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

More SQL & Data Manipulation questions with a free account

Behavioral & Leadership15 questions · ~135 min

Driving CI Regression AdoptionMedium

Tests ownership and influence in driving automated regression into CI/CD, especially when trust, release speed, and test stability are in tension.

CI/CDregression testingAutomation

Costar

More Behavioral & Leadership questions with a free account

Create a free account to unlock this list and practice real interview questions.

The finish line: interview-readyComplete all 24 questions plus 1 hands-on drill to finish this plan.