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Prep plan
Updated weekly · Last refresh Aug 30

Rakuten Data Scientist Interview Questions

The questions to prepare for a Rakuten Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~62 min
2
Metrics3 questions · ~25 min
Diagnose a Sudden DAU DropHard

Investigate whether an 8.2% DAU decline is driven by product breakage, logging issues, or normal seasonal patterns.

DAU/MAUDiagnosisTime SeriesRakuten
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3
Statistics & Probability4 questions · ~33 min
Statistical Significance and Confidence IntervalsEasy

Explain how statistical significance and confidence intervals are interpreted in a product experiment.

Confidence IntervalsHypothesis TestingStatistical SignificanceRakuten
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4
Machine Learning11 questions · ~92 min
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 LearningRakuten
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5
A/B Testing & Experimentation3 questions · ~25 min
Design Test for Novelty and SpilloversHard

Design an experiment that accounts for novelty effects and network spillovers before deciding whether to ship.

Network InterferenceExperimentationNovelty EffectRakuten
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6
Behavioral & Leadership15 questions · ~125 min
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7
More topics9 questions · ~75 min
Batch vs Streaming Data ProcessingEasy

Compare batch and streaming data processing, including when each fits best in a pipeline.

Stream ProcessingETLBatch ProcessingRakuten
Prioritize Marketing Strategy DataMedium

Framework for deciding which data matters most when shaping a marketing strategy.

Feature PrioritizationUser NeedsProduct VisionRakuten
Collaborative Filtering RecommenderMedium

Tests practical recommender system implementation and understanding of collaborative filtering.

ML RankingFeature StoreRecommendation SystemsRakuten
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.