Scale AI Data Engineer Interview Guide

The Scale AI 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

What the Scale AI loop tests: domains and difficulty

Our prediction of the question mix by domain and difficulty for this company's data engineer loop, from live listings and interview reports.

By domain

SQL

33%

Python

67%

By difficulty

Easy

42%

Medium

42%

Hard

17%

The domain and difficulty mix we predict for a Scale AI data engineer loop, across 12 problems. It updates as more Scale AI data lands.

Updated Jul 31, 202612 predicted Scale AI problems

Try a Scale AI-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

Practice the Scale AI loop

The problems our model expects in this company's interview, grouped by round. Work the shapes that come up, not the ones that read well on a list.

SQL3 to work

EASY~5m

Top Performing Models

Auth Service Health Checks

Solve →

Python3 to work

EASY~5m

What Won't Convert

Error HandlingSolve →

All Scale AI-style problems →

Scale AI is hiring data engineers now

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

Hiring now

Scale AI data engineer · live from career pages

open roles

San Francisco Bay Area

top metro

Scale AI is seeking a highly skilled and motivated AI Data Engineer to join our dynamic Federal Engineering team.

L4St. Louis21d ago

8+ years of full-time engineering experience, post-graduation with specialties in back-end systems, specifically related to building large-scale data storage, streaming, and warehousing systems.

L6San Francisco22d ago

Build synthetic data pipelines to generate enterprise environments to use for RL post-training

L4San Francisco22d ago

Scale AI is seeking a highly skilled and motivated Software Engineer to join our dynamic Public Sector Engineering team.

L4New York22d ago

In this role, you will lead the design and development of core data storage, streaming, caching, and indexing platforms and underlying systems.

L6San Francisco Bay Area55d ago

Build systems capable of handling millions of frames of data every day, making it available to both our workforce and our internal teams with high availability.

L4New York City98d ago

New postings per week

4/20

6/1

6/22

7/6

week beginning · ~11 weeks of data

Where they hire

San Francisco Bay Area

Washington DC

New York

Levels hiring

L44L62

Updated Jul 31, 202613 open listings across 3 cities

Scale AI compensation and culture

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

Data engineering at Scale AI→

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

Compare Scale AI 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→

Compare the role, comp, and interview loop.

Data engineering at Apple→

Compare the role, comp, and interview loop.

Data engineering at Databricks→

Compare the role, comp, and interview loop.

02 / Why practice

Prepare at Scale AI 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 Scale AI-level SQL

Related Guides

Data Engineering at Scale AI→

The Scale AI DE role, comp, tech stack, and culture.

DE Interview Prep Guide→

Complete preparation framework for data engineering interviews.

Data Modeling Questions→

Star schema, SCD, grain definition, and normalization.