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Product Manager / プロダクトマネージャー - Mercari Shops (BtoC領域新規事業)

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 - Mercari Shops (BtoC領域新規事業)

Overview

Position: Product Manager (Mercari Shops / New B2C Business)
Employment Type: Full-time
Work Style: Flextime (no core hours)
Location: Roppongi (Minato City, Tokyo, Japan)
Language: Japanese (Proficient, CEFR B2 or above) required; English (Independent, CEFR B1 or above) preferred

Responsibilities

As a Product Manager, you will own everything from strategy to execution for Mercari Shops and new B2C services, leading a cross-functional team made up of engineers, designers, data analysts, and others. Under an AI-powered development structure, you will take end-to-end ownership and drive everything from problem discovery to business outcomes.

Key Responsibilities

  1. Define the vision, strategy, and roadmap

    • Define the ideal state of Mercari Shops / the new services, and formulate a mid-to-long-term vision and an actionable roadmap
    • Based on quantitative/qualitative data and market/competitive trends, decide the priorities most directly tied to business growth while building alignment with the leadership team and related divisions

  2. Discovery and generating a high-quality backlog

    • Integrate diverse inputs—quantitative, qualitative, market, and competitive—to continuously supply a high-quality product backlog equipped with testable hypotheses and success conditions
    • Use generative AI to accelerate research and prototyping and to run validation cycles faster

  3. Leading product development

    • Under a structure in which engineers lead development end-to-end, the PdM concentrates on hypothesis validation and key decisions
    • Continuously improve and expand a wide range of products—not only the end-user-facing Mercari App / Web, but also the various management features (inventory, orders, promotions, etc.) of the merchant dashboard used daily on the shop operations front lines, as well as public APIs.

  4. Launch & Learning (designing for reach, usage, and learning)

    • Don't treat the release as the finish line: lead GTM design including Push/promotion/PR and coordination with related divisions (Marketing/CRM/CS, etc.)
    • Monitor post-launch growth and long-term impact, and design the Next Action

  5. Collaboration with stakeholders

    • Requirement coordination and prioritization with Sales / BizDev / CS, Trust & Safety / Legal / Risk, Compliance, Marketing, CRM, and group companies, as well as reporting to and alignment with the leadership team

Examples of Tools Used

  • General chat / generative AI: Gemini, Claude
  • Knowledge QA / research support: Notion AI, NotebookLM (upload documents + Q&A)
  • Development support: Cursor, GitHub Copilot, Claude Code, Devin, Codex, Gemini Code Assist
  • Workflow automation / AI app development: n8n, Dify

Unique Challenges

  • For Mercari, historically a C2C marketplace, this is the challenge of connecting buyers with operators and brands through B2C user experiences, further raising the value we can offer as a marketplace.
  • Mercari has 23 million monthly users; being able to deliver and propose new value at that scale is a unique appeal of this position.
  • Under a development structure assuming AI, you can raise the resolution of the team's discussions and decisions starting from working prototypes, freeing the PdM to focus on Discovery and Outcome. You can move the product forward with broad discretion—including planning and driving new user experiences.
  • Depending on your results, the scope you are entrusted with can expand significantly—ultimately, this is a position where you can gain the experience of running not just "one product" but "one business."

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.

Japanese (原文: 求める経験・スキル)

  • メルカリグループおよ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顧客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

  • 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
  • Experience in business development and product development in B2C/B2B business domains, and experience collaborating with sales organizations
  • Experience in user-centric design and development, such as user journey maps and UX design
  • Work experience using English, or experience in product development with multinational teams

Japanese (原文: 歓迎する経験・スキル)

  • 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、テスト結果にもとづく意思決定の経験
  • B2C/B2B事業ドメインの事業開発・プロダクト開発経験、および営業組織との協業経験
  • カスタマージャーニーマップやUXデザインなど、お客さま視点に立った設計・開発の経験
  • 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

Language Requirements

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

Additional Information

  • For more information about the Mercari Group, visit:

Selection Process

  1. Document screening
  2. Interviews (multiple rounds depending on position)
  3. Reference check (online format, around the final interview)
  4. Offer (decided based on final interview and reference check results)

Equal Opportunity

At Mercari, we aim to realize a society in which an individual's potential is not predetermined by their background and everyone has the opportunity to freely create value. In our hiring activities as well, we pledge to eliminate all discrimination based on age, gender, sexual orientation, race, religion, physical ability, or any other attribute.

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