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Rakuten

Senior Data Scientist, Business Data Solution Group - Business Support Development Department (BSD)

LocationTokyo, Japan
SenioritySenior
Experience3+ yrs
Company size10,000+ people
PostedAug 5, 2026 · 2mo ago
Verified live7h ago
At a glanceSummarised by Seekless from the posting.
Must have11
Over 3 years of experience in data analysis and machine learning modeling
Strong knowledge of machine learning (including deep learning) and generative AI
Advanced analysis methods for finding and solving business problems
Evaluating and tuning machine learning models and generative AI models
Python programming experience (with main data science libraries)
Experience with SQL
Knowledge of statistics
Communication skills
Presentation skills (explaining complex analysis ideas clearly)
Business level or higher Japanese and English
TOEIC Score 800 above or possess equivalent abilities
Nice to have7
Experience developing AI for fraud detection (fraudulent payment detection)
Experience in consulting
Experience developing and operating data science services
Experience in the e-commerce industry
Knowledge of causal inference
Experience developing machine learning platforms
Experience using BI tools like Tableau
Skills
Python
SQL
Tableau
machine learning
deep learning
generative AI
statistics
causal inference
Job Description:
Business Overview
Rakuten Group, Inc. is an innovative internet service company based in Japan. About 100 million customers in Japan and 1 billion customers globally use its services.
Rakuten offers over 70 services in many areas. These include e-commerce, payment services, financial services, telecommunications, media, and sports. It is building the “Rakuten Ecosystem” to make people’s lives and society better. Rakuten aims to give customers the best services and entertainment. It also wants to use technology to help its businesses grow.
Department Overview
The EC Business Data Analytics & Platform Section is part of the Business Support Development Department (BSD) within the Commerce & Marketing Company.
It develops and operates a data platform that uses the large amount of data from Rakuten Ichiba, which is a main business of Rakuten Group, Inc.
This section provides the following main services and functions to speed up Rakuten Ichiba’s business growth using data and AI.
Data Platform (DWH) Development and Operation
It designs, builds, and operates a data warehouse (DWH) that brings together and stores many kinds of Rakuten Ichiba data. This provides a strong and scalable data base.
Data Pipeline Development and Operation
It develops and operates data pipelines for real-time and batch processing. This makes data collection, processing, and connection automatic, providing a steady data supply.
Data Solutions (Data Processing, BI)
It develops data analysis, visualization, and reporting functions. This helps business intelligence (BI) and provides solutions that support fast and accurate decisions based on data.
AI Solution Development and Operation
It uses machine learning and AI technology to develop and operate new AI solutions. These include predictive analysis, automation, customer behavior analysis, and AI agents, which create new business value.
Position:
Why We Hire
We are looking for Data Scientists to make our data analysis and AI solution development stronger. For this job, we are looking for people who can solve business problems using machine learning, generative AI, and advanced analysis methods. You will work on fraud detection (fraudulent payment detection).
Position Details
You will handle all data science tasks that use Rakuten Ichiba’s large amount of data to make business grow faster. Specifically, you will help develop and use new AI solutions through the following tasks:
Finding business problems and planning data strategies
•
You will work with product managers and other business departments to find business problems that data science can solve by asking questions
•
You will define the data needed to solve problems and plan and carry out efficient and effective data collection strategies
Advanced data analysis and AI solution development
•
You will use advanced methods like statistics, machine learning, and generative AI on the collected data to find deep insights
•
You will design and test experimental plans for AI solutions that use machine learning models and generative AI to solve business problems
•
You will continuously fine-tune models to make the developed solutions more accurate and better
Sharing results and checking effects
•
You will make reports of experiment results and analysis results that are clear and easy to understand visually
•
You will give insightful presentations based on data to stakeholders to help them make decisions
•
You will continuously check the effects of released solutions and suggest improvements based on objective measurements
Mandatory Qualifications:
•
Over 3 years of experience in data analysis and machine learning modeling
•
Strong knowledge of machine learning (including deep learning) and generative AI
•
Advanced analysis methods for finding and solving business problems
•
Evaluating and tuning machine learning models and generative AI models
•
Python programming experience (with main data science libraries)
•
Experience with SQL
•
Knowledge of statistics
•
Communication skills
•
Presentation skills (explaining complex analysis ideas clearly)
•
Business level or higher Japanese and English
Desired Qualifications:
•
Experience developing AI for fraud detection (fraudulent payment detection)
•
Experience in consulting
•
Experience developing and operating data science services
•
Experience in the e-commerce industry
•
Knowledge of causal inference
•
Experience developing machine learning platforms
•
Experience using BI tools like Tableau
Other Information:
Additional information on Location
Rakuten Crimson House (Head office)
Additional information on English Qualification
TOEIC Score 800 above or possess equivalent abilities
#engineer #datascientist #commerce #RakutenIchiba
Languages:
English (Overall - 3 - Advanced), Japanese (Overall - 4 - Fluent)
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