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Product Manager / プロダクトマネージャー(Metadata) - Mercari Marketplace

Salary not provided

Japanese only
Japanese: Fluent

Minimum year of experience: 3

Mercari

Product Manager / プロダクトマネージャー (Metadata) - Mercari Marketplace

Overview

Location: Roppongi, Minato City, Tokyo, Japan
Employment Type: Full-time
Work Style: Flextime (no core hours)
Hybrid/Onsite: Hybrid
Seniority: Mid-Career

Description

Mercari Marketplace's Metadata team is responsible for creating structured and high-quality product data (categories, brands, product attributes, and catalog data) to power all core marketplace experiences such as search, recommendations, listing, and price suggestions. Through AI-enabled development, Product Managers lead cross-functional teams from strategic planning to execution and outcome measurement.

You will own the vision, strategy, and delivery for the Metadata area, collaborating closely with engineers, designers, data analysts, and other stakeholders.

Responsibilities

  • Define the vision, strategy, and roadmap for the metadata platform
    • Define the ideal state of each type of metadata, and establish a 1–3 year vision and an actionable roadmap
    • Decide priorities tied to business growth based on market/competitive trends and data while building alignment with leadership and related divisions
    • Design KPIs and build a monitoring structure
  • Continuously improve metadata quality
    • Plan concrete improvement initiatives for each type of metadata; partner with project managers and operations teams to design data schemas and deliver them incrementally
    • Define metrics for metadata quality and build mechanisms for automated quality improvement using AI and other technologies
  • Build and expand catalog data
    • Select and evaluate external data sources in collaboration with business teams; lead business discussions and contract negotiations
    • Define mapping policy between acquired data and Mercari's existing master data with relevant teams
  • Lead product development
    • Coordinate requirements with engineering teams, manage the backlog, and set priorities
    • Design and evaluate effectiveness validation; manage releases
  • Collaborate with stakeholders
    • Coordinate requirements and priorities with other teams leveraging metadata (e.g., Search/Recommendation, cross-border commerce, new businesses)
    • Report to and build alignment with leadership

Examples of tools used:
Gemini, Claude, Notion AI, NotebookLM, Cursor, GitHub Copilot, Claude Code, Devin, Codex, Gemini Code Assist, n8n, Dify

Unique Challenges

  • Mercari’s metadata is fundamental to all core product and user experiences, directly impacting marketplace revenue and new business growth.
  • Many areas are still in early stages (“white space”) offering opportunity for foundational impact.
  • Design optimal data structures for diverse product groups (e.g., trading cards, home appliances, fashion, anime/games/entertainment), with unique C2C challenges.
  • Full ownership beyond data platform: plan and drive in-app experiences, business negotiations, and data procurement.
  • Transform a process that is still largely manual by leveraging AI.

Requirements

Required experience / skills

  • You resonate with the mission and values of the Mercari Group and of each company
  • You can demonstrate consistent ownership from product discovery through delivering value to users, using AI
  • Experience using AI tools for research, hypothesis validation, and prototyping; integrating data/user understanding; and improving the quality and speed of decision-making
  • Experience taking responsibility for business outcomes such as KPIs (not the number of features) and leading the full cycle of discover → build → learn
  • Experience not stopping at release, but designing through "reach, usage, and learning"—driving GTM, cross-divisional coordination, and post-launch learning
  • Experience in product management for internet services (3+ years)
  • Basic knowledge of software development (agile, etc.) and experience collaborating with engineering teams
  • Experience extracting insights through data analysis using SQL, etc.

求める経験・スキル (Japanese Verbatim)

  • メルカリグループ及び各カンパニーのミッション・バリューに共感いただける方
  • AIを活用し、プロダクトディスカバリーから価値をお客さまに届けるまで一貫したオーナーシップを発揮できる方
  • AIツールを調査・仮説検証・プロトタイピングに使い、データ/顧客理解を統合し、意思決定の質とスピードを上げた経験
  • 機能数ではなくKPIなどの事業成果に責任を持ち、発見→開発→学習の一連をリードした経験
  • リリースで終わりにせず、「届く・使われる・学べる」までを設計し、GTM・関係部門連携・リリース後の学習を推進した経験
  • インターネットサービスにおけるプロダクトマネジメントの経験（3年以上）
  • ソフトウェア開発（アジャイル等）の基礎知識と、エンジニアチームとの協働経験
  • SQL等を用いたデータ分析によるインサイト抽出の経験

Preferred Experience / Skills

  • Experience building and operating master data such as categories, brands, and catalogs
  • Knowledge of taxonomy
  • Knowledge of the CtoC marketplace / e-commerce / commerce domain
  • Cross-boundary skills: a practical feel for at least one of BE/Frontend/Design/Data, usable for building prototypes and for dialogue with engineers
  • Experience in both 0→1 (new launches) and 1→N (improving existing products)
  • Experience in stakeholder coordination and alignment with Legal/BizOps/leadership/external partners, etc.
  • Understanding of A/B testing and experience making decisions based on test results
  • Work experience using English, or experience in product development with multinational teams
  • Experience in team management

歓迎する経験・スキル (Japanese Verbatim)

  • カテゴリー・ブランド・カタログ等をはじめとするマスターデータの構築・運用経験
  • Taxonomy（分類学）に関する知見
  • CtoCマーケットプレイス・EC・コマース領域の知見
  • 越境スキル：BE/Frontend/Design/Dataのいずれか1つ以上に実務感覚があり、プロトタイプ作成やエンジニアとの対話に活かせる
  • 0→1（新規立ち上げ）と1→N（既存改善）の両方の経験
  • Legal/BizOps/経営層/社外パートナー等とのステークホルダー調整・合意形成の経験
  • A/Bテストの理解と、テスト結果に基づく意思決定の経験
  • 英語を用いた業務経験、または多国籍チームでのプロダクト開発経験
  • チームマネジメントの経験

Language

  • Japanese: Proficient (CEFR B2) or above required
  • English: Independent (CEFR B1) or above preferred (those able to acquire it within 6 months of joining)

語学力 (Japanese Verbatim)

  • 日本語：Proficient（CEFR B2）以上必須
  • 英語：Independent（CEFR B1）以上歓迎（入社後6ヶ月以内に習得可能な方）

Selection Process

  • Document screening
  • Interviews: multiple rounds depending on the position
  • Reference check: online response format (conducted around the final interview)
  • Offer: decided based on the results of the final interview and the reference check

Equal Opportunity

Mercari is committed to building a workplace free from discrimination of any kind, including age, gender, sexual orientation, race, religion, physical ability, or any other attribute, ensuring a diverse and inclusive environment aligned with our mission and values.

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