Dataford
Top 19
Prep plan
Updated weekly · Last refresh Aug 30

CareDx Data Engineer Interview Questions

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

19questions
~3htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~46 min
Find Duplicate Records in SQLEasy
Practice

Use GROUP BY and HAVING to find duplicate patient records in a Johns Hopkins Medicine dataset.

Data WranglingGroup ByHavingCareDx
Indexing for Database PerformanceEasy

Tests understanding of indexing tradeoffs and how indexes affect query performance and cost.

SubqueriesJoinsData WranglingCareDx
Optimize a Slow SQL QueryMedium

Tests your performance troubleshooting skills for dv01-scale reporting queries.

JoinsData WranglingCTEsCareDx
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
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
2
Pipelines15 questions · ~129 min
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingCareDx
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCareDx
Cloud Pipeline Data SecurityMedium

Key security considerations for a cloud data pipeline, from ingestion through storage, orchestration, and monitoring.

InfrastructureGovernanceETLCareDx
Diagnose an Integration Pipeline IssueMedium

Structured approach to diagnose failures in an ETL integration, from source extraction through orchestration, data quality, and idempotent recovery.

ToolsDependenciesQualityCareDx
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3
More topics1 question · ~9 min
Efficient Data Retrieval StructureEasy

Tests practical understanding of data structures and how they impact lookup and query performance.

Hash TablesArraysSearchingCareDx
The finish line: interview-readyComplete all 19 questions plus 2 hands-on drills to finish this plan.