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Updated weekly · Last refresh Nov 6
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Lion Data Scientist Interview Questions

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

8questions
~1htotal time
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1
SQL & Data ManipulationStart here. 1 question + 2 drills · ~30 min
SQL Window Functions Moving AverageMedium
Practice

Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.

Window FunctionsData AnalysissqlLLion
Running Average With Window FunctionsEasy
Practice
Practice drill

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

Window FunctionsData AnalysissqlHingeCCatalyst Operations & AnalyticsEEsri
Using SQL Window FunctionsMedium
Practice
Practice drill

Calculate three-day rolling passenger entry averages for TfL stations using aggregation and window functions.

Window FunctionsData AnalysissqlTransport for LondonThe Trade DeskMercari
2
Product Sense2 questions · ~19 min
Metrics for New Product LaunchHard

Design a launch metric system that measures user value, business impact, and product health.

product metricsconsiderationsproduct launchLLion
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 PropositionLLion

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3
Metrics1 question · ~10 min
Diagnosing a 10% Metric DropHard

Build a systematic process to validate, decompose, and explain a sudden 10% drop in core engagement.

root cause analysisDiagnosisdiagnostic processLLion
4
A/B Testing & Experimentation2 questions · ~19 min
Network Interference in Collaboration TestMedium

Explain when network interference threatens an A/B test, how it biases estimates, and how to redesign the experiment safely.

Network InterferenceExperimentationA/B TestingLLion
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 MismatchLLion
5
Behavioral & Leadership2 questions · ~19 min
Your Working Style and ImpactEasy

Tests self-awareness, collaboration, adaptability, and ownership through a specific team contribution.

self assessmentteamworkadaptabilityLLion
Conflicting Data And ResolutionMedium

Tests analytical judgment, ownership, and communication when data sources conflict.

analytical mindsetbehavioralanalytical judgmentLLion
The finish line: interview-readyComplete all 8 questions plus 2 hands-on drills to finish this plan.