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Updated weekly · Last refresh Aug 30

Facebook Data Scientist Interview Questions

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

23questions
~3htotal time
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1
A/B Testing & ExperimentationStart here. 5 questions · ~40 min
Diagnose Novelty in UI TestEasy
Recently asked

Explain novelty effect in an A/B test and how it can make an early engagement lift look better than the long-term truth.

ExperimentationNovelty EffectFacebook
Design Reels Share-Sheet ExperimentEasy
Recently asked

Design a Facebook Reels share-sheet A/B test and explain Type I vs Type II errors through hypothesis, power, guardrails, and decision rules.

Facebook
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2
Metrics4 questions · ~32 min
Facebook Marketplace Success MetricsMedium
Recently asked

Evaluates product and measurement thinking for marketplace outcomes at Facebook.

MetricsFacebook
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3
Machine Learning3 questions · ~24 min
Why LoRA MattersMedium
Recently asked

Evaluates understanding of model adaptation techniques and when to apply them.

Facebook
LoRA and Expected Output CodingMedium
Recently asked

Assesses coding ability and correctness in producing expected outputs.

CodingFacebook
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4
SQL & Data Manipulation4 questions + 3 drills · ~62 min
SQL Case Study With Business MetricsHard
Recently asked

Assesses end-to-end problem solving from SQL to business metric evaluation.

case studysqlFacebook
Analyze Signup Funnel Drop-OffHard
Practice
Practice drill

Use CTEs, joins, and aggregations to measure user drop-off across a multi-step signup funnel.

JoinsCase WhenAggregationsFacebookIntuitAsana
SQL Day-Over-Day GrowthMedium
Practice
Practice drill

Calculate daily active Instagram Creators and day-over-day growth using a date spine, aggregation, and LAG.

Date FunctionsAggregationsFacebook
SQL Top 10% by EngagementMedium
Practice
Practice drill

Rank Facebook users by total session duration and return the top 10% using aggregation and NTILE.

Rankingtop kFacebook
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5
Behavioral & Leadership3 questions · ~24 min
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6
More topics4 questions · ~32 min
Bayes and Probability FoundationsMedium
Recently asked

Tests core statistics knowledge and ability to apply Bayes and distributions to real problems.

probabilitysqlFacebook
Instagram Followers Case StudyMedium
Recently asked

Assesses product sense, metric selection, and structured problem solving.

case studyuser engagementFacebook
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The finish line: interview-readyComplete all 23 questions plus 3 hands-on drills to finish this plan.