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Updated weekly · Last refresh Aug 30

Philadelphia Staffing Data Engineer Interview Questions

The questions to prepare for a Philadelphia Staffing Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 5 questions + 3 drills · ~71 min
Normalization vs Denormalization TradeoffsMedium

Explain normalization, why it improves data integrity, and when denormalization is a practical performance tradeoff.

schema designperformanceData ModelingPhiladelphia Staffing
SQL Constraints for IntegrityMedium

Assesses knowledge of SQL constraints and their role in enforcing correctness and integrity.

sqldata integrityPhiladelphia Staffing
Optimizing Slow QueriesHard

Tests ability to diagnose and improve query performance using indexing, query rewriting, and execution-plan reasoning.

Performance Tuningquery optimizationsqlPhiladelphia Staffing
Handling Duplicate RecordsMedium

Evaluates strategies for detecting and resolving duplicates while preserving data quality at scale.

Data QualitysqlPhiladelphia Staffing
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Write a Query for Repeated RowsMedium
Practice
Practice drill

Find repeated Zomato order items using GROUP BY, HAVING, a CTE, and STRING_AGG.

sqldata integrityZomato
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
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2
Behavioral & Leadership5 questions · ~41 min
Automating Web Testing with SeleniumMedium

Evaluates practical experience with Selenium and element-locating strategies for reliable automation.

seleniumAutomationtechnical experiencePhiladelphia Staffing
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3
More topics3 questions · ~24 min
Method Overloading vs OverridingEasy

Compare method overloading and method overriding in object-oriented programming, including binding, inheritance, and polymorphism.

javaabstractionoopPhiladelphia Staffing
Walk Through Your ETL FlowMedium

Assesses your ability to explain ETL architecture, tooling choices, and end-to-end data movement.

ETLPhiladelphia Staffing
Selenium Wait TypesMedium

Evaluates your practical knowledge of Selenium synchronization and reliable web test execution.

seleniumPhiladelphia Staffing

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