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データサイエンティスト/ Data Scientist

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A renowned technology company is seeking a Data Scientist. The successful candidate will lead data science projects, analyse complex datasets, develop visualisations, improve data systems, and communicate actionable insights to stakeholders. This is a long-term contract role.

Responsibilities:

  • Develop, implement, and optimise statistical models and machine learning algorithms
  • Analyse complex datasets to identify trends and generate business insights
  • Lead data science projects from conception through to deployment
  • Collaborate with product, engineering, marketing, IT, and data engineering teams to integrate solutions into business processes
  • Provide technical guidance and mentorship to junior data scientists and analysts
  • Develop dashboards and reports to communicate findings and recommendations
  • Research emerging data science methodologies and technologies
  • Present research findings and represent the organisation at conferences and seminars
  • Oversee data systems and databases to maintain data integrity, efficiency, and security
  • Improve data collection, storage, and retrieval processes
  • Communicate complex findings clearly to technical and non-technical stakeholders
  • Engage stakeholders to understand business needs and deliver data-driven solutions
  • Provide regular updates on project progress and outcomes

Requirements:

  • Master’s degree or above in Physics, Mathematics, or a related field
  • More than 5 years of experience in data science within the marketing or advertising industry
  • Demonstrated experience leading data science projects with measurable business impact
  • Expertise in model development, tuning, and applying data science to business scenarios
  • Proficiency in Python, SQL, and Hive
  • Strong applied statistical knowledge, including statistical tests, distributions, regression analysis, and maximum likelihood estimation
  • Advanced knowledge of machine learning methods, including k-Nearest Neighbours, Naive Bayes, Support Vector Machines, and Decision Forests
  • Strong understanding of multivariable calculus and linear algebra
  • Proficiency in data wrangling and handling imperfect datasets
  • Experience with data visualisation tools such as Tableau, matplotlib, ggplot, and d3.js
  • Business level English (TOEIC 800+)

Preferred requirements:

  • PhD in Physics, Mathematics, or a related field
  • Experience with machine learning libraries such as Scikit-learn, TensorFlow, or PyTorch
  • Familiarity with DBT, Airflow, Docker, and Kubernetes
  • Strong background in software engineering
  • Proficient in Japanese

About the Company:

A leading Japanese technology company operating across e-commerce, fintech, digital content and communications. The company develops a wide range of digital services and platforms that connect consumers and businesses in Japan and international markets.

Keywords:

データサイエンティスト, データ分析, 機械学習, 統計モデリング, Python, SQL, データ可視化, マーケティング分析, 広告分析, データエンジニアリング, 求人, 外資系

Job Ref: N9H49H

Contract Type: Contract / Haken

Specialism: Information Technology

Focus: Data Analysis

Industry: New Media and Internet

Salary: Negotiable based on experience

Workplace Type: On-site

Experience Level: Associate

Language: English - Business level

Second Language: Japanese - Professional working

Location: Tokyo

Job Reference: N9H49H-BF6D989B

Date posted: 16 October 2026

Consultant: Yulia Urutina