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Rakuten Payment Data Engineer Interview Questions

The questions to prepare for a Rakuten Payment Data Engineer interview. Questions from real interview reports rank first. Updated daily.

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1

CodingStart here. 6 questions · ~54 min

Hard Python Practice (Codility Task 2)Hard

Count fixed-length strings containing a pattern exactly k times, including overlaps, using KMP automata and dynamic programming.

pythonRRakuten Payment

Count Vowels in a StringEasy

Practice

Implement a function to count the number of vowels in a given string.

StringsRRakuten Payment

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2

SQL & Data Manipulation13 questions + 2 drills · ~136 min

SQL Query to Remove Duplicate RowsMedium

Identify and delete duplicate payment transactions while retaining the row with the smallest payment ID.

deduplicationdata cleaningqueriesRRakuten Payment

SQL Top-N Without LimitHard

Evaluates Postgres limits knowledge and advanced SQL ranking techniques.

sql queriesRRakuten Payment

Detect and Resolve Duplicate TransactionsMedium

Identify duplicate transaction rows and explain a safe resolution process for Zions Bancorporation.

deduplicationdata cleaningdata accuracy

Zions Bancorporation

SQL Duplicate Survey ResponsesMedium

Use ROW_NUMBER to retain the latest response for each survey, respondent, and question combination.

deduplicationdata cleaningrow_number

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3

Pipelines22 questions · ~196 min

Data Skew in PartitioningMedium

Tests understanding of skew and its performance implications in distributed pipelines.

partitioningRRakuten Payment

Transformer Model BasicsMedium

Tests foundational understanding of transformer models and core concepts.

Machine LearningRRakuten Payment

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4

Behavioral & Leadership7 questions · ~62 min

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5

More topics2 questions · ~18 min

IP Version BasicsEasy

Tests basic networking knowledge relevant to data systems and integrations.

Networkingtechnical knowledgeRRakuten Payment

Payment Database Architecture Trade-offsHard

Tests system design judgment for database choices in payment-grade workloads.

Trade-offsdatabase architectureRRakuten Payment

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