Rakuten Symphony Data Scientist Interview Questions
The questions to prepare for a Rakuten Symphony Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Calculate regional cumulative telecom usage with a CTE, join, aggregation, and window function.
Rakuten SymphonyCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
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Spotify
Meta ITDesign a recommendation and ranking system that handles cold start for both new users and new items without hurting feed quality.
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Investigate sample ratio mismatch and decide whether an experiment readout is trustworthy enough to ship.
Rakuten SymphonyExplain the bias-variance tradeoff and how it guides model choice, regularization, and generalization performance.
Rakuten SymphonyDefine a metric framework for a smart tool platform that captures adoption, engagement, and retention in a way that reflects real user value.
Rakuten SymphonyExplain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.
Rakuten SymphonyDiagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.
Rakuten SymphonyExplain how to evaluate a regression model with RMSE and MAE, and how to interpret the tradeoff between average and large errors.
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