LANXESS Data Scientist Interview Questions

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

6questions

~1htotal time

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SQL & Data ManipulationStart here. 1 question + 2 drills · ~30 min

Explain window functions and calculate a rolling average for time-series measurements.

Calculate a rolling average of order values per Zomato user using a window function.

Calculate each user's rolling 30-day average transaction volume using PostgreSQL window functions.

A/B Testing & Experimentation1 question · ~10 min

Identify interference, randomization, metric, and operational risks when testing Cognite workflows involving shared teams or equipment.

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Metrics1 question · ~10 min

Diagnose Processing Efficiency DropHard

Select and decompose the first metrics needed to diagnose a sudden 15% decline in operational processing efficiency.

KPIoperational metricsLeading IndicatorsLLANXESS

Pipelines1 question · ~10 min

Consistency Across Data SourcesMedium

Approach for keeping records aligned and trustworthy when multiple source systems feed the same pipeline.

InfrastructureQualityLLANXESS

Behavioral & Leadership2 questions · ~20 min

Pivoting Under ConstraintsMedium

Tests adaptability, prioritization, and ownership when a project encounters unexpected obstacles.

project experienceadaptabilityaccountabilityLLANXESS

Explaining Technical Issues ClearlyMedium

Tests audience-aware communication, ownership, and the ability to make complex technical risks actionable.

audience analysisStakeholder ManagementCommunicationLLANXESS

The finish line: interview-readyComplete all 6 questions plus 2 hands-on drills to finish this plan.