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The Federal National Mortgage Association - Fannie Mae Data Scientist Interview Questions

The questions to prepare for a The Federal National Mortgage Association - Fannie Mae Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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Behavioral & LeadershipStart here. 4 questions · ~36 min
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SQL Moving Average With WindowsMedium
Practice

Calculate each customer’s 30-day moving average of daily transaction totals using aggregation and a PostgreSQL window frame.

Data AnalysisThe Federal National Mortgage Association - Fannie Mae
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueThe Federal National Mortgage Association - Fannie Mae
Explain Statistical SignificanceMedium

Assesses ability to translate statistical concepts into clear, stakeholder-friendly explanations.

CommunicationStatistical SignificanceThe Federal National Mortgage Association - Fannie Mae
Diagnose Loan Approval Rate DropMedium

Evaluates structured troubleshooting of business metrics using data and causal reasoning.

Data AnalysisDiagnosisThe Federal National Mortgage Association - Fannie Mae
Account For Seasonality In ExperimentsMedium

Evaluates experimental design choices that control for seasonal effects in housing metrics.

experiment designseasonalityThe Federal National Mortgage Association - Fannie Mae
SQL Latest Loan Per BorrowerMedium

Assesses SQL skills for deduplicating and selecting the latest record per entity.

sqlThe Federal National Mortgage Association - Fannie Mae
A/B Testing Pitfalls And MitigationMedium

Assesses experience preventing bias, leakage, and invalid conclusions in experiments.

A/B TestingThe Federal National Mortgage Association - Fannie Mae
Post-COVID Market RecoveryHard

Evaluates product sense and ability to reason about housing market dynamics using data signals.

market analysisThe Federal National Mortgage Association - Fannie Mae

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
Top Users by Region QueryMedium
Practice
Practice drill

Rank the top 10 ResMed myAir users in each region using joins, aggregation, and ROW_NUMBER().

Data AnalysissqlResmed
The finish line: interview-readyComplete all 12 questions plus 2 hands-on drills to finish this plan.