Fannie Mae Data Engineer Interview Guide

The Fannie Mae data engineer loop, round by round: what each stage tests, example questions with the guidance interviewers actually score, the mistakes that sink strong candidates, and how to prepare.

Last updated: July 31, 2026Proudly published by: Jeff Wahl

6 real Fannie Mae interview questions

Reported by candidates from real loops, tagged by domain, round, level, and year. Expand for what the round is scoring.

PythonL5 · 2025

how to validate the data mismatch between 2 dataframes

Phone screen · screen sql

PythonL5 · 2024

How would you handle missing data code-wise?

Behavioral

PythonL3 · 2024

What is a class in Python?

Onsite · python

PythonL5

how to validate the data mismatch between 2 dataframes

Technical · screen

PythonL5

How would you handle missing data code-wise?

Technical · screen

PythonL3

What is a class in Python?

Technical · screen

Try a Fannie Mae-style SQL round

Find every user active on 3 or more CONSECUTIVE days. This gaps-and-islands shape shows up in nearly every DE SQL round. Edit the query and run it against the seed data.

	/* Users active on 3+ consecutive days. */
	/* Hint: date minus a per-user ROW_NUMBER is constant within a streak. */
	WITH streaks AS (
	SELECT
	user_id,
	activity_date,
	activity_date - CAST(
	(ROW_NUMBER() OVER (
	PARTITION BY user_id
	ORDER BY activity_date
	))
	AS INT
	) AS grp
	FROM user_sessions
	)

	SELECT
	user_id
	FROM streaks
	GROUP BY user_id, grp
	HAVING COUNT(*) >= 3

Fannie Mae is hiring data engineers now

The roles behind this loop. Prep against the levels and locations they are actually filling.

Hiring now

Fannie Mae data engineer · live from career pages

open roles

Washington DC

top metro

Lead the design, development, and modernization of scalable data platforms, pipelines, and engineering capabilities on AWS cloud.

L5Multiple locations37d ago

Define and lead the Single-Family data engineering strategy for structured and unstructured data in alignment with Enterprise Data strategy.

L5Reston52d ago

Where they hire

Washington DC

Levels hiring

L52

Updated Jul 31, 20262 open listings across 1 city

Fannie Mae compensation and culture

The numbers, tech stack, and team structure live on the company overview.

Data engineering at Fannie Mae→

The role, comp by level, tech stack, teams, and culture signals.

Compare Fannie Mae with other data engineering employers

How the role, pay, and loop stack up against peer companies.

Data engineering at Airbnb→

Compare the role, comp, and interview loop.

Data engineering at Amazon→

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Data engineering at Apple→

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Data engineering at Databricks→

Compare the role, comp, and interview loop.

02 / Why practice

Prepare at Fannie Mae interview difficulty

01
Reading a solution is not the same as writing one
Every engineer who has frozen on a query they had read a dozen times knows the gap. The only preparation that closes it is producing the answer yourself, under time, before the interview does it for you
02
76% of hiring managers reject on the coding task, not the resume
From HackerRank's 2024 Developer Skills Report. Candidates who look strong on paper still fail the live screen if they haven't done timed, executable practice
03
5 problem shapes cover 80% of data engineer loops
Dedup, sessionization, top-N-per-group, slowly-changing dimensions, partition tricks. Writing the shapes by hand turns the unfamiliar into pattern recognition

Practice Fannie Mae-level SQL

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