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Prep plan
Updated weekly · Last refresh Aug 30

Reddit Machine Learning Engineer Interview Questions

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

30questions
~4htotal time
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1
System DesignStart here. 6 questions · ~48 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 ModelsReddit
Design a Cold-Start Feed RankerMedium
Recently asked

Design a personalized feed ranking system that handles new users and new content under tight latency at large scale.

Cold StartFeature StoreRetrievalReddit
Design a Low Latency Inference PlatformHard
Recently asked

Design a low latency ML inference platform for high-frequency online predictions with strict response times and evolving model features.

high-frequency requestslatencysystem architectureReddit
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2
Coding7 questions · ~56 min
Trie Autocomplete for SearchMedium
Recently asked

Tests data structure knowledge and ability to map it to a real product feature.

SearchingTreesReddit
Custom Metrics from ScratchMedium
Recently asked

Tests understanding of evaluation metrics and their behavior under skewed class distributions.

MetricspythonClass ImbalanceReddit
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3
Machine Learning8 questions · ~65 min
Live Engagement Classifier with Scikit-LearnMedium
Recently asked

Tests feature engineering, model selection, and validation for engagement prediction.

Feature Engineeringmodel trainingSupervised LearningReddit
Sequential vs Transformer Trade-OffsMedium
Recently asked

Tests model architecture trade-offs for sequential user behavior modeling.

Neural NetworksDeep Learningmodel trainingReddit
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4
Behavioral & Leadership8 questions · ~65 min
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5
More topics1 question · ~8 min
A/B Test for Home FeedHard
Recently asked

Tests experimental design, statistical thinking, and metric selection for product impact.

experiment designModel EvaluationA/B TestingReddit
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