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Eli Lilly and Machine Learning Engineer Interview Questions

The questions to prepare for a Eli Lilly and Machine Learning Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
Machine LearningStart here. 9 questions · ~72 min
Data Preprocessing for Reliable ModelsEasy

Explain why data preprocessing matters, using a concrete supervised learning example with missing values, outliers, and mixed feature types.

Cross-ValidationFeature EngineeringSupervised LearningEli Lilly and
Describe an ML ProjectEasy

Walk through a past ML project with clear problem framing, modeling choices, evaluation, and measurable impact.

Cross-ValidationFeature EngineeringSupervised LearningEli Lilly and
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2
Statistics & Probability3 questions · ~24 min
Clinical Drug Efficacy Experiment DesignHard

Tests ability to design ML-informed clinical efficacy experiments and choose appropriate statistical methods.

ExperimentationHypothesis TestingA/B TestingEli Lilly and
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3
More topics5 questions · ~40 min
Collaborating Across Diverse TeamsEasy

Share how you aligned a diverse cross-functional team, managed differing perspectives, and delivered a shared outcome.

Trade-offsRisk AssessmentScope ManagementEli Lilly and
Motivation in Healthcare Product WorkEasy

Explain what drives your work and how you connect motivation to meaningful user and patient impact in healthcare.

User NeedsValue PropositionUse CasesEli Lilly and
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityEli Lilly and
Approach to Underperforming ModelsMedium

Structured approach for diagnosing an underperforming model and deciding whether to fix data, thresholding, calibration, or the model.

PrecisionAccuracyRecallEli Lilly and
Clinical Model Evaluation MetricsMedium

Tests selection of clinically meaningful metrics and understanding of tradeoffs in healthcare evaluation.

PrecisionAccuracyRecallEli Lilly and

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