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Updated weekly · Last refresh Oct 17

ConcertAI Data Engineer Interview Questions

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

28questions
~4htotal time
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1
PipelinesStart here. 20 questions · ~171 min
Optimize Multi-Terabyte ETL PipelineMedium

Explain how you improved a slow ETL pipeline on multi-terabyte data, including bottleneck analysis, tuning choices, and validation.

ETL optimizationdata processingperformanceConcertAI
Data Modeling Tools and ArchitectureEasy

Preferred tools and patterns for data modeling and pipeline architecture in a modern data platform.

InfrastructureToolsData ModelingConcertAI
Data Quality in ML PipelinesMedium

Approach for maintaining high quality data across ML pipelines, from ingestion through feature generation and model consumption.

Data QualityInfrastructureData WranglingConcertAI
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2
Coding4 questions · ~34 min
Time Complexity for Data AlgorithmsMedium

Tests understanding of algorithmic efficiency and how it affects large-scale data processing.

Hash TablesMathArraysConcertAI
API to Database Python ScriptMedium

Tests ability to build reliable data ingestion code from APIs into persistent storage.

Hash TablesArraysSortingConcertAI
Cleaning and Analyzing with PandasEasy

Tests hands-on data wrangling and analysis skills using pandas.

Hash TablesArraysSortingConcertAI
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3
More topics4 questions · ~34 min
Top Customers by Sales RevenueEasy
Practice

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

RankingGroup ByAggregationsConcertAI
Optimizing a Slow QueryMedium

Tests skill in diagnosing and improving query performance using practical techniques.

Joinsquery optimizationAggregationsConcertAI
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
SQL for Top ReadmissionsMedium
Practice
Practice drill

Calculate and rank patient readmission rates using admission history and a 30-day readmission definition.

null handlingData ManipulationRankingConcertAI
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
The finish line: interview-readyComplete all 28 questions plus 2 hands-on drills to finish this plan.