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Updated weekly · Last refresh Aug 30

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 weekly.

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
Machine Learning10 questions · ~80 min
Bias-Variance Tradeoff in Model ChoiceEasy

Explain how the bias-variance tradeoff guides algorithm selection and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationPrincipal Financial Group
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3
Pipelines10 questions · ~80 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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4
Metrics6 questions · ~48 min
Measure Solution ImpactEasy

Tests your ability to define metrics and evaluate outcomes for Principal Financial Group stakeholders.

KPIsLeading IndicatorsDiagnosisPrincipal Financial Group
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5
Product Sense5 questions · ~40 min
Advocating Data-Driven DecisionsMedium

Tests your ability to influence stakeholders using evidence, metrics, and clear tradeoffs.

User NeedsValue PropositionProduct VisionPrincipal Financial Group
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6
Statistics & Probability10 questions · ~80 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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7
More topics4 questions · ~32 min
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
End-to-End Generative AI ProjectHard

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

Principal Financial Group
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Window Functions for AnalyticsEasy
Practice
Practice drill

Use a CTE and ROW_NUMBER to rank active retirement plan participants by first-quarter contributions.

Window FunctionsRankingCTEsPrincipal Financial Group
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
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.