Top 14
Prep plan
Updated weekly · Last refresh Oct 17

Yahoo Research Scientist Interview Questions

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

14questions
~3htotal time
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1
CodingStart here. 3 questions · ~32 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersYahoo
Binary Tree Traversal ImplementationEasy
Practice

Return a binary tree's inorder traversal using an explicit stack and depth-first search.

RecursionStackdfsYahoo
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2
Machine Learning7 questions · ~75 min
Bias-Variance Tradeoff in Model ChoiceEasy

Explain how the bias-variance tradeoff guides algorithm selection and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationYahoo
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 LearningYahoo
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffYahoo
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3
Statistics & Probability3 questions · ~32 min
Statistical Test SelectionMedium

Tests understanding of hypothesis testing and correct selection based on assumptions.

Hypothesis TestingStatistical SignificanceP-ValuesYahoo
Handling Outliers in DatasetsMedium

Tests robustness thinking and practical strategies for cleaning and modeling noisy data.

outliersRegressionCausal InferenceYahoo
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4
More topics1 question · ~11 min
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