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Prep plan
Updated weekly · Last refresh Aug 30

Rakuten Machine Learning Engineer Interview Questions

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

28questions
~4htotal time
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1
CodingStart here. 7 questions · ~62 min
2
System Design3 questions · ~26 min
Deploy a Personalized Ranking ModelMedium

Design a production deployment path for a personalized ranking model, with serving, feature consistency, drift handling, and experiment driven rollout.

InfrastructureFeature DriftModel ServingRakuten
Design a Personalized Product RecommenderHard

Design an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.

Feature StoreFeature DriftModel ServingRakuten
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3
Machine Learning7 questions · ~62 min
Feature Engineering and Model PerformanceEasy

Explain how feature engineering improves supervised model performance and how to validate its impact with proper evaluation.

Feature EngineeringBias-Variance TradeoffSupervised LearningRakuten
Design a Machine Learning ModelMedium

Explain the main considerations for designing a supervised ML model, from features and validation to regularization and deployment.

Feature EngineeringDeep LearningSupervised LearningRakuten
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4
Behavioral & Leadership6 questions · ~53 min
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5
More topics5 questions · ~44 min
Approach to Underperforming ModelsMedium

Structured approach for diagnosing an underperforming model and deciding whether to fix data, thresholding, calibration, or the model.

PrecisionAccuracyRecallRakuten
MLOps Importance in LifecycleMedium

Tests your understanding of operationalization, monitoring, and reliability for ML systems at Rakuten.

InfrastructureSchedulingOrchestrationRakuten
Llama and LangChain ExperienceMedium

Tests your practical experience building LLM applications using frameworks relevant to Rakuten.

Language ModelsText ClassificationWord EmbeddingsRakuten
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The finish line: interview-readyComplete all 28 questions to finish this plan.