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Updated weekly · Last refresh Oct 17

Flatiron Health Data Engineer Interview Questions

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

43questions
~6htotal time
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1
SQL & Data ManipulationStart here. 14 questions + 2 drills · ~144 min
Handling Missing Data in SQLEasy

Explain practical SQL techniques for handling NULLs and missing values in product analysis without biasing metrics.

Data WranglingCase WhenAggregationsFlatiron Health
OLTP vs OLAP Database DesignMedium

Explain OLTP vs OLAP designs, including schema shape, workload patterns, and when each is appropriate in a data platform.

financial dataperformanceData ModelingFlatiron Health
Design a Customer SchemaMedium

Evaluates your practical schema design and SQL querying skills.

schema designdatabaseFlatiron Health
SQL for Unique Patient RecordsMedium
Practice
Practice drill

Return one latest clinical record per patient while removing duplicate patient records.

SubqueriesJoinsData WranglingFlatiron Health
Working With SQL, R, Python, and AWSEasy
Practice
Practice drill

Summarize completed SQL, R, Python, and AWS runs for each data work item.

JoinsData ManipulationsqlFlatiron Health
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2
Pipelines8 questions · ~71 min
Design an End-to-End Data PipelineMedium

Approach for designing an end-to-end data pipeline from ingestion through transformation, storage, and downstream consumption.

data pipelinedesigningestionFlatiron Health
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityFlatiron Health
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3
Coding8 questions · ~71 min
Currency Conversion CodingMedium

Evaluates your coding ability to implement currency conversion logic from structured inputs.

tuplescurrency conversionFlatiron Health
Binary Tree HeightMedium

Tests your understanding of tree traversal and correctness in algorithm implementation.

Flatiron Health
Adjacent Value Pairs DistanceMedium

Assesses your algorithmic thinking and implementation skills for array-based problems.

Flatiron Health
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4
Behavioral & Leadership13 questions · ~115 min
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The finish line: interview-readyComplete all 43 questions plus 2 hands-on drills to finish this plan.