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Updated weekly · Last refresh Aug 30

Cohere Applied Scientist Interview Questions

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

23questions
~3htotal time
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1
CodingStart here. 3 questions · ~27 min
KNN From ScratchHard
Practice

Implement K-nearest neighbors from scratch to classify a Develop Health patient record using Euclidean distance and majority voting.

MathArraysSearchingCohere
Time Complexity of Sorting AlgorithmsEasy

Compare common sorting algorithms by best, average, and worst-case time complexity and explain when each is appropriate.

MathArraysSortingCohere
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2
Machine Learning6 questions · ~55 min
Prevent Overfitting in ML ModelsEasy

Explain how to reduce overfitting using regularization, validation, and model selection.

Cross-ValidationBias-Variance TradeoffRegularizationCohere
Preprocessing Data With Missing ValuesMedium

Explain how to preprocess missing data for a supervised learning task without introducing leakage or degrading model quality.

Cross-ValidationFeature EngineeringSupervised LearningCohere
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3
System Design3 questions · ~27 min
Design Cold Start for RecommendationsHard

Design a recommendation system strategy for model cold start and new-user cold start, including serving, evaluation, and safe rollout.

Cold StartRetrievalTwo-Tower ModelsCohere
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4
Behavioral & Leadership8 questions · ~73 min
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5
More topics3 questions · ~27 min
A/B Testing for Product FeaturesMedium

Explain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.

Hypothesis TestingStatistical SignificanceA/B TestingCohere
Precision vs Recall TradeoffEasy

Explain the difference between precision and recall, and how each reflects a different type of classification error.

Evaluation TechniquesClassificationConfusion MatrixCohere
A/B Testing a New AlgorithmMedium

Tests your experimental design skills, metrics, and statistical reasoning for reliable conclusions.

Confidence IntervalsStatistical SignificanceA/B TestingCohere
The finish line: interview-readyComplete all 23 questions to finish this plan.