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Updated weekly · Last refresh Oct 17

LexisNexis Legal & Professional Data Scientist Interview Questions

The questions to prepare for a LexisNexis Legal & Professional Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~54 min
Window Functions for Top UsersMedium
Practice

Use aggregation and ROW_NUMBER to find the top three Lexis+ users by total session duration within each region.

Window FunctionsData AnalysissqlLexisNexis Legal & Professional
Using SQL Window FunctionsMedium
Practice
Practice drill

Demonstrate LEAD, LAG, and RANK to compare employee usage across months and rank usage within each month.

Window FunctionsLag/LeadJoinsComcast
SQL Window Functions Moving AverageMedium
Practice
Practice drill

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

Window FunctionsData AnalysissqlEEvalueserveSShyena Tech YarnsAATB Financial
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2
Machine Learning3 questions · ~26 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffLexisNexis Legal & Professional
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3
A/B Testing & Experimentation3 questions · ~26 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 MismatchLexisNexis Legal & Professional
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4
Product Sense3 questions · ~26 min
Business Risks of Legal AIMedium

Assesses your ability to connect AI technical choices to legal, operational, and customer risks.

LexisNexis Legal & Professional
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5
Behavioral & Leadership9 questions · ~77 min
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6
More topics6 questions · ~51 min
Statistical Significance in Hypothesis TestingEasy

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

Hypothesis TestingData AnalysisStatistical SignificanceLexisNexis Legal & Professional
First Checks for Metric DropsEasy

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosisLexisNexis Legal & Professional
Explain Your Chosen Topic DeeplyHard

Evaluates depth of technical understanding and how you respond to targeted follow-ups.

experienceLexisNexis Legal & Professional
Designing LLM Summary Accuracy PipelineHard

Evaluates system design for quality assurance of LLM outputs in legal workflows.

pipeline designAccuracyllmLexisNexis Legal & Professional
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The finish line: interview-readyComplete all 28 questions plus 2 hands-on drills to finish this plan.