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Updated weekly · Last refresh Oct 17

Principal Financial Group Data Scientist Interview Questions

The questions to prepare for a Principal Financial Group Data Scientist interview. Questions from real interview reports rank first. Updated daily.

50questions
~7htotal time
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1
Model EvaluationStart here. 5 questions · ~40 min
Assessing Model OverfittingMedium

Explain how to determine whether a model is overfitting, using validation performance and generalization checks.

Cross-ValidationBias-Variance TradeoffAccuracyPrincipal Financial Group
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2
Pipelines10 questions · ~81 min
Deploy AI Pipelines on AWSMedium

Discuss how to deploy AI data pipelines on AWS, including orchestration, data quality, and security controls.

InfrastructureCloudPrincipal Financial Group
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3
Machine Learning11 questions · ~89 min
Explain Random ForestsEasy

Explain how random forests work, why they reduce variance, and when they are a good choice.

Cross-ValidationEnsemble MethodsDecision TreesPrincipal Financial Group
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4
Metrics6 questions · ~48 min
Business Impact of Your ModelEasy

Tests your ability to translate model results into measurable outcomes for Principal Financial Group stakeholders.

KPIsLeading IndicatorsDiagnosisPrincipal Financial Group
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5
Statistics & Probability10 questions · ~81 min
EDA for Market ShiftsMedium

Tests your EDA approach to detect drivers of changes affecting Principal Financial Group customers and markets.

DistributionsCorrelationTime SeriesPrincipal Financial Group
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6
Product Sense4 questions · ~32 min
Why Principal Financial GroupEasy

Assesses motivation and fit for Principal Financial Group’s Data Scientist role.

User NeedsValue PropositionProduct VisionPrincipal Financial Group
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7
More topics4 questions · ~32 min
End-to-End Generative AI ProjectHard

Assesses your ability to deliver an end-to-end generative AI solution.

Principal Financial Group
SQL for Data ExtractionEasy

Tests your ability to query and extract reliable datasets for analysis and modeling at Principal Financial Group.

JoinsGroup ByAggregationsPrincipal Financial Group
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Optimize a Slow SQL QueryHard
Practice
Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingAmeripriseEEltro Cyberchrome PrivateEnergyHub
SQL for Duplicate RecordsEasy
Practice
Practice drill

Identify repeated Principal claims using GROUP BY, a CTE, and a LEFT JOIN to member details.

Group ByHavingAggregationsTeachablePrincipal Financial Group
Create SQL Table StatementEasy
Practice
Practice drill

Create a PostgreSQL table with typed columns, defaults, primary key, uniqueness, and status validation.

database managementdatabase designdata integrityPrincipal Financial Group
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.