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Updated weekly · Last refresh Aug 30

Flatiron Health Data Analyst Interview Questions

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

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1
Statistics & ProbabilityStart here. 4 questions · ~32 min
Clinical Data Statistical MethodsMedium

Tests your statistical toolkit for analyzing oncology and real-world clinical data.

Hypothesis TestingCausal InferenceStatistical SignificanceFlatiron Health
Handling Missing DataMedium

Tests your approach to missingness, imputation, and bias in clinical datasets.

Hypothesis TestingCausal InferenceData WranglingFlatiron Health
Descriptive Stats for OncologyMedium

Tests your skill in summarizing oncology data and communicating key findings.

DistributionsHypothesis TestingFlatiron Health
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2
SQL & Data Manipulation13 questions + 3 drills · ~134 min
Data Abstraction Across CancersMedium

Tests your ability to design analysis-ready representations across heterogeneous cancer cohorts.

JoinsData WranglingCase WhenFlatiron Health
SQL Query for Patient DataMedium

Tests your ability to write correct SQL for patient-level data extraction.

JoinsGroup ByAggregationsFlatiron Health
Optimizing Slow SQL QueriesHard

Tests your performance tuning skills for large-scale clinical datasets.

SubqueriesJoinsCTEsFlatiron Health
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact
Average Vehicle Idle Time by ZoneHard
Practice
Practice drill

Use joins, a CTE, and aggregations to calculate average vehicle idle minutes in a specific geographic zone.

JoinsData ManipulationsqlWaymo
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3
Behavioral & Leadership18 questions · ~144 min
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4
More topics2 questions · ~16 min
Identifying Trends Over TimeMedium

Tests your time-series thinking and methods for trend detection in outcomes data.

Leading IndicatorsDiagnosisTime SeriesFlatiron Health
R Data Manipulation PipelinesHard

Tests your ability to implement robust R data transformations with clear pipeline structure.

data pipelineFlatiron Health

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