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

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

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1
PipelinesStart here. 3 questions · ~24 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityThe Federal National Mortgage Association - Fannie Mae
ETL and Orchestration ExperienceMedium

Evaluates your hands-on experience with ETL, SQL, and job orchestration tools relevant to data pipelines.

ETLsqlThe Federal National Mortgage Association - Fannie Mae
Fixing Data Pipeline FlawsMedium

Tests your ability to debug pipeline issues and drive reliable fixes.

Data Qualitydata pipelineProblem SolvingThe Federal National Mortgage Association - Fannie Mae
2
SQL & Data Manipulation8 questions + 3 drills · ~94 min
Customer Orders: LEFT vs INNER JOINEasy

Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.

JoinsData WranglingGroup ByThe Federal National Mortgage Association - Fannie Mae
Join Types in Data PipelinesMedium

Evaluates your understanding of join semantics and their impact on pipeline correctness.

data pipelinesqljoin typesThe Federal National Mortgage Association - Fannie Mae
Validating DataFrame MismatchesMedium

Tests your ability to detect and investigate discrepancies between datasets using programmatic checks.

data validationThe Federal National Mortgage Association - Fannie Mae
SQL Moving Average With WindowsMedium
Practice
Practice drill

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

Data AnalysisJJP Morgan ChaseFinacleThe Federal National Mortgage Association - Fannie Mae
SQL: Customers With Multiple OrdersEasy
Practice
Practice drill

Use a join, month-level grouping, and HAVING to find VistaPrint customers with multiple orders in the same month.

aggregationJoinssqlCCimpress Technology
SQL for Top Customer SpendMedium
Practice
Practice drill

Rank the top three EPAM India customers by item-level spending over the last three months using joins and aggregation.

aggregationJoinssqlEEPAM IndiaEPAM Systems
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3
Behavioral & Leadership9 questions · ~72 min
Explaining a Technical Concept ClearlyEasy
Recently asked

Tests communication, ownership, and stakeholder management when translating technical complexity into actionable business understanding.

Problem SolvingData Structurestechnical fundamentalsThe Federal National Mortgage Association - Fannie Mae
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4
More topics1 question · ~8 min
Python Classes BasicsEasy

Assesses foundational understanding of Python object-oriented concepts.

pythonoopThe Federal National Mortgage Association - Fannie Mae
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.