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Senior Data Scientist / シニアデータサイエンティスト - Mercari Marketplace

Salary not provided

Python
English: BasicJapanese: Fluent

Minimum year of experience: 5

Mercari

Senior Data Scientist / データサイエンティスト

Position Overview

  • Employment Status: Full-time / 正社員
  • Work Hours: Full flextime (no core time) / フレックスタイム制（コアタイムなし）
  • Location: Roppongi / 六本木

About the Organization

Mission:
Circulate all forms of value to unleash the potential in all people
あらゆる価値を循環させ、あらゆる人の可能性を広げる

We aim to empower individuals by enabling the circulation of all forms of value—beyond just physical goods and money—helping everyone realize their ambitions and contribute to society, using technology to connect people worldwide.

Team Mission

  • The Data Science Team’s mission is to maximize user engagement and long-term value (LTV).
  • The team designs and develops advanced models and systems for personalized CRM to elevate user experience.
  • Strategic pillars:
    • Drive independent, high-impact initiatives.
    • Collaborate cross-functionally with product and engineering teams to integrate data-driven intelligence throughout the marketplace.
  • Senior Data Scientists lead complex product and technical initiatives, working closely with backend teams, infrastructure specialists, designers, marketers, and product managers.

Work Responsibilities

  • Identify high-impact opportunities and advocate innovative, data-driven, personalized CRM strategies.
  • Design, develop, and deploy advanced statistical and machine learning models, robust evaluation frameworks, and inference pipelines (batch and streaming) with thorough monitoring.
  • Conduct end-to-end data exploration and modeling to resolve complex business bottlenecks and optimize platform performance.
  • Translate technical findings into actionable insights, collaborating closely with stakeholders throughout the development lifecycle.
  • Partner with leadership on strategic proposals to maximize data science and engineering capabilities.
  • Promote best practices in data analysis, modeling, and code quality management.

Unique Challenges

  • End-to-End Project Ownership:
    Lead the entire project lifecycle from concept and stakeholder alignment to execution and post-launch refinement.
  • Defining New Frontiers:
    Architect solutions in CRM and personalization where blueprints do not exist, combining deep technical expertise with domain intuition to pioneer new industry standards.

Qualifications

Required

  • PhD or MSc in Statistics, Mathematics, Computer Science, or related quantitative field.
  • 5+ years’ experience using advanced analytics/systems to drive strategic business decisions.
  • Expertise in statistical analysis, machine learning, A/B testing, and causal inference.
  • Collaborative track record with Marketing, Product, and Engineering teams for rapid product iteration.
  • Exceptional verbal and written communication skills for influencing executive stakeholders.
  • Proficiency in Python and SQL.
  • Japanese language proficiency (CEFR – C1 or above).

Preferred

  • Strong ownership and business (P/L) mindset, with proven impact on business KPIs.
  • Relentless execution—ability to deliver high-quality results in dynamic, fast-paced environments.
  • Domain expertise in marketing science or CRM optimization in high-growth technology settings.
  • MLOps experience developing/maintaining production-grade inference pipelines (batch and real-time).
  • Leadership in successfully leading large-scale projects end-to-end.
  • English proficiency (CEFR – B2 or higher recommended).

Equal Opportunity

We are committed to providing a fair, inclusive hiring process and workplace, eliminating discrimination based on age, gender, sexual orientation, race, religion, physical ability, or any other attribute.

Further details:

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