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Updated weekly · Last refresh Sep 20
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Adform Data Scientist Interview Questions

The questions to prepare for a Adform Data Scientist interview. Questions from real interview reports rank first. Updated daily.

16questions
~2htotal time
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1
Product SenseStart here. 3 questions · ~24 min
Balance Revenue and User ExperienceEasy

Approach for balancing monetization with user experience in a product decision.

User NeedsValue PropositionProduct VisionAAdform
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2
A/B Testing & Experimentation4 questions · ~32 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchAAdform
Ensure Statistical Validity of A/B TestsMedium

Evaluates experimental rigor, assumptions, and safeguards for reliable inference.

experiment designA/B TestingAAdform
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3
Behavioral & Leadership3 questions · ~24 min
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4
More topics6 questions · ~48 min
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisAAdform
Object-Oriented ML and RegressionMedium

Assesses ability to connect software design practices with implementing and reasoning about linear regression models.

RegressionoopAAdform
SQL for Engagement Over TimeMedium

Assesses SQL skills for time-based engagement analysis.

Window FunctionsDate FunctionsAggregationsAAdform
Explain Statistical SignificanceMedium

Assesses communication skills for conveying statistical ideas to non-technical audiences.

CommunicationStatistical SignificanceAAdform
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsAAdform
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Users SQL QueryMedium
Practice
Practice drill

Count valid daily interactions and return the top three users using aggregation and deterministic ranking.

data cleaningDate FunctionsGroup By
Retention for Linked AccountsMedium
Practice
Practice drill

Calculate month-over-month retention for Truebill users who linked a bank account during their first week.

Window FunctionsLag/LeadDate FunctionsTruebill
Consecutive Activity Days QueryMedium
Practice
Practice drill

Identify each user's consecutive website activity streaks using date arithmetic and SQL window functions.

Window FunctionsDate FunctionsData ManipulationIntuit Management ConsultancyChewyAllstate
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