Pinterest Research Engineer Interview Questions

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

13questions

~2htotal time

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CodingStart here. 3 questions · ~28 min

Build a trie to return Pinterest Search suggestions sharing a prefix in lexicographic order.

Translate Math to Functional CodeMedium

Assesses ability to convert mathematical formulations into correct, testable code.

Optimize Code to Avoid OverheadMedium

Tests performance engineering skills and ability to reduce runtime overhead effectively.

Machine Learning7 questions · ~65 min

Evaluates your ability to implement core machine learning algorithms and training procedures.

Loss Function Trade-offsMedium

Assesses ability to choose and justify loss functions for recommendation objectives at scale.

loss functionsTrade-offsRecommendation Systems

Debug ML Pipeline FailuresHard

Assesses diagnostic reasoning for ML pipeline issues tied to data distribution shifts.

Debugging

Handling Data SparsityMedium

Evaluates strategies for learning under sparse signals in Pinterest content and recommendation data.

model training

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Behavioral & Leadership3 questions · ~28 min

Iterate After Model UnderperformsMedium

Evaluates experimental iteration practices and how you improve model performance after setbacks.

model performance

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