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Updated weekly · Last refresh Oct 17

Charlie Health Engineering Data Analyst Interview Questions

The questions to prepare for a Charlie Health Engineering Data Analyst interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 4 questions + 3 drills · ~62 min
Handling Missing and Dirty SQL DataMedium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityCharlie Health Engineering
Solve Problems With a DatasetHard

Assesses end-to-end analytical thinking from dataset to case study deliverable.

Problem Solvingcase studyCharlie Health Engineering
SQL Aggregation FunctionsEasy

Tests knowledge of SQL aggregation and how to summarize datasets.

Data WranglingGroup ByAggregationsCharlie Health Engineering
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
Python or R Analysis LibrariesMedium
Practice
Practice drill

Count unique respondents by Python or R library and return the most commonly used libraries first.

analytics toolsData ManipulationData WranglingOklahoma City Thunder
Cleaning a Messy DatasetMedium
Practice
Practice drill

Filter invalid game events and normalize event names using PostgreSQL string and null handling.

missing valuesdata cleaningnull handlingQuantiumScopelyCarvana
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2
Pipelines3 questions · ~24 min
Modeling for Analytics PlatformsMedium

Tests data modeling tradeoffs for analytics usability, performance, and correctness.

ETLData ModelingQualityCharlie Health Engineering
Healthcare Database Schema DesignHard

Tests database design skills for healthcare analytics and operational data needs.

InfrastructureData ModelingQualityCharlie Health Engineering
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3
Behavioral & Leadership6 questions · ~48 min
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4
More topics3 questions · ~24 min
Analyze New Feature EngagementMedium

Assess a new feature using adoption, activation, repeat usage, and retention metrics tied to user value.

Leading IndicatorsA/B TestingEngagement MetricsCharlie Health Engineering
Mean and Median FunctionEasy

Tests your basic statistical computation skills and coding correctness.

DistributionsData WranglingExpected ValueCharlie Health Engineering
Answer Questions With Data ModelsMedium

Tests ability to translate business questions into modeled analytics using raw data.

KPIsLeading IndicatorsDiagnosisCharlie Health Engineering

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The finish line: interview-readyComplete all 16 questions plus 3 hands-on drills to finish this plan.