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Updated weekly · Last refresh Oct 17

Llc. Data Scientist Interview Questions

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

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1
A/B Testing & ExperimentationStart here. 3 questions · ~27 min
Detect Interference in Ops ExperimentHard

Assess whether interference between nearby units could bias an operations experiment and how to test for it.

Network InterferenceExperimentationCausal InferenceLlc.
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 MismatchLlc.
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2
Product Sense3 questions · ~27 min
Balance Conversion and RetentionHard

Framework for deciding when to favor short-term conversion gains versus long-term retention in a product decision.

Feature PrioritizationUser NeedsValue PropositionLlc.
Design Metrics for Feature LaunchMedium

Assesses your ability to define actionable launch metrics and measurement plans.

Llc.
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3
Behavioral & Leadership4 questions · ~36 min
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4
More topics5 questions · ~45 min
Running Average With Window FunctionsEasy
Practice

Calculate each Hinge user's 30-day rolling average of daily interactions using CTEs and window functions.

Window FunctionsData AnalysissqlLlc.
Statistical Significance in Hypothesis TestingEasy

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceLlc.
Investigate User Engagement DeclineMedium

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

RetentionDiagnosisEngagement MetricsLlc.
Explain Significance SimplyMedium

Tests your ability to communicate uncertainty and decision impact clearly to stakeholders.

CommunicationStatistical SignificanceLlc.
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Use Window FunctionsMedium
Practice
Practice drill

Demonstrate window functions by ranking active employees by salary within each department.

Window FunctionsData ManipulationRankingJohnson & JohnsonCRIFRegions
SQL and Data ManipulationMedium
Practice
Practice drill

Aggregate qualifying customer orders and classify customers by total completed spend.

JoinsData ManipulationsqlImpetusFlywireLlc.
The finish line: interview-readyComplete all 15 questions plus 2 hands-on drills to finish this plan.