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Cognitiv Interview Questions

The questions to prepare for Cognitiv interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 10 questions · ~89 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysCognitiv
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersCognitiv
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2
System Design7 questions · ~62 min
3
Machine Learning8 questions · ~71 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 TradeoffCognitiv
Bias-Variance Tradeoff in PracticeMedium

Explain the bias-variance tradeoff and how it guides model choice, regularization, and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationCognitiv
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4
Execution10 questions · ~89 min
Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope ManagementCognitiv
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5
Pipelines9 questions · ~80 min
Production Pipeline Quality MonitoringMedium

Approach for adding data quality checks, observability, and production monitoring to a data pipeline.

Data QualitymonitoringobservabilityCognitiv
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6
Model Evaluation3 questions · ~27 min
Improve Model AccuracyMedium

Approach for improving a model's accuracy by checking errors, features, and tuning choices.

Hyperparameter TuningCross-ValidationAccuracyCognitiv
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7
More topics3 questions · ~27 min
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