Dataford
Top 21
Prep plan
Updated weekly · Last refresh Aug 30

Lazard Data Scientist Interview Questions

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

21questions
~3htotal time
Track your progressSign up free to work through all 21 questions and resume where you left off.
Start practicing free →
1
Machine LearningStart here. 10 questions · ~80 min
Handling Missing Data in MLMedium

Explain practical strategies for handling missing data and how to validate that the chosen approach improves model performance.

Feature EngineeringData WranglingSupervised LearningLazard
Build a Predictive Model from DataMedium

Build a supervised model from a dataset, from feature prep through validation and deployment choices.

Cross-ValidationFeature EngineeringSupervised LearningLazard
More Machine Learning questions with a free account
2
Pipelines3 questions · ~24 min
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLLazard
Preprocessing a Large DatasetMedium

Tests data cleaning, transformation, and scalability considerations before modeling.

ETLData ModelingQualityLazard
More Pipelines questions with a free account
3
Statistics & Probability3 questions · ~24 min
Monty Hall ProbabilityHard

Tests core probability reasoning and the ability to explain counterintuitive outcomes.

DistributionsExpected ValueConditional ProbabilityLazard
More Statistics & Probability questions with a free account
4
More topics5 questions · ~40 min
Using Metrics to Drive DecisionsEasy

Explain how you used a KPI and supporting metrics to diagnose a product issue and make a concrete product decision.

Funnel AnalysisKPIsLeading IndicatorsLazard
Choosing Classification Evaluation MetricsEasy

Explain which classification metrics to use and how metric choice depends on the business objective and error tradeoffs.

PrecisionAccuracyRecallLazard
SQL Insights From Financial DataMedium

Tests SQL proficiency and your ability to translate business questions into queries for financial data.

JoinsGroup ByAggregationsLazard
More questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Sales RevenueEasy
Practice
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.