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

Mercari, Inc. (Tokyo, Japan) Follow 3 hours ago

Full-time B2C Dialogues Prototyping User Experience Design PDM

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JD in Japanese follows. 英文の後に和文JDをご覧いただけます。

Product Manager (Mercari Shops (New B2C Business))

Employment type: Full-time employee
Work style: Flextime (no core hours)
Location: Roppongi

For details, please see the application guidelines on our careers site.

About the Mercari Group

Circulate all forms of value to unleash the potential in all people

"With the earth's resources limited, what can we do to build a more abundant society?" In 2013, the flea market app "Mercari" was born out of this sense of purpose that founder Shintaro Yamada developed during a trip around the world. We believe that by circulating all forms of value—not limited to physical goods and money—we can expand everyone's options to realize what they want to do and to contribute to people and society.

Through the power of technology we connect people around the world and work to realize a world in which the potential of all people can be unleashed. For the Mercari Group's direction, please see the Mercari Culture Doc.

Organization / Team Mission

In the Marketplace business, we aim to realize a global marketplace that creates new value—driving the growth of diverse businesses through the creation of user value. Starting with the operation of Mercari, Japan's largest flea-market service, we advance the Mercari Group's mission through our cross-border business and various new ventures.

In the B2C area, we hold the mission of "growing Mercari Shops and new B2C services as a business." For Mercari, which has grown as a C2C marketplace, by increasing products that are uniquely supplied by B2C operators and are difficult to source via C2C, we aim to elevate the value of the marketplace as a whole. While leveraging the assets of our existing businesses such as traffic acquisition, logistics, and payments, we will pioneer new markets and user segments.

Under a development structure that assumes AI, we pursue both speed and the maximization of user value at the same time. Product Managers concentrate on the most important problem discovery (Discovery) and business outcomes (Outcome), and move the product forward in small, autonomous teams.

For details on Mercari's mission and values, please see here.

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 on the job

General chat / generative AI: Gemini, Claude
Knowledge QA / research support: Notion AI, NotebookLM (upload documents + Q&A)
Development support (code completion / coding agents / IDE): Cursor, GitHub Copilot, Claude Code, Devin, Codex, Gemini Code Assist
Workflow automation / AI app development (no-code / low-code): n8n, Dify

Unique Challenges

For Mercari, which has grown as 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 that is hard to find elsewhere.
Under a development structure that assumes AI, you can raise the resolution of the team's discussions and decisions starting from working prototypes, freeing the PdM to focus on the Discovery and Outcome they should truly concentrate on. Beyond the data platform and product development, 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.

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

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)

※ For details on CEFR, please see here.

Get to know the Mercari Group

Careers site https://careers.mercari.com/
Mercan: https://mercan.mercari.com/
SNS: X / Linkedin

About the selection process

At the Mercari Group, we value resonance with and embodiment of our mission and values. To build an organization that maximizes the total value our members create, we want to accurately understand each candidate's experience and skills.

Selection flow

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

※ For details, please see this page.

Equal opportunity in our selection process

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. We believe that "Inclusion & Diversity" is indispensable to realizing our mission.

In our hiring activities as well, so that people of diverse backgrounds who resonate with Mercari's mission and values can join us, we promise to eliminate all discrimination based on age, gender, sexual orientation, race, religion, physical ability, or any other attribute.

For details, please see the I&D statement.

Please also review our Privacy Policy when you apply.

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

雇用形態：正社員
働き方：フレックスタイム制（コアタイムなし）
勤務地：六本木

詳細はキャリアサイトの募集要項よりご確認ください。

メルカリグループについて

あらゆる価値を循環させ、あらゆる人の可能性を広げる

「地球資源が限られているなか、より豊かな社会をつくるために何ができるか」。2013年、創業者の山田進太郎が世界一周の旅で抱いた課題意識から、フリマアプリ「メルカリ」は生まれました。私たちは、物理的なモノやお金に限らずあらゆる価値を循環させることで、誰もがやりたいことを実現し、人や社会に貢献するための選択肢を増やすことができると信じています。

テクノロジーの力で世界中の人々をつなぎ、あらゆる人の可能性が発揮される世界を実現していきます。メルカリグループの目指すべき方針については Mercari Culture Doc をご覧ください。

組織・チームのミッション

マーケットプレイス事業では、顧客価値の創出を通じてさまざまな事業の成長を推進し、新たな価値を生み出す世界的なマーケットプレイスの実現を目指しています。日本最大のフリマサービスであるメルカリの運営をはじめ、越境事業や種々の新規事業を通してメルカリグループのミッション実現を推進しています。

B2C領域では、メルカリShopsおよびB2Cの新規サービスを「事業として伸ばす」ことをミッションに掲げています。これまでC2Cマーケットプレイスとして成長してきたメルカリにおいて、C2Cでは供給が難しいB2C事業者ならではの商品を増やすことで、マーケットプレイス全体の価値を一段引き上げることを目指します。既存事業の集客・物流・決済といったアセットを活かしながら、新しい市場とお客さま層を開拓していきます。

私たちは、AIを前提とした開発体制のもとで、スピードと顧客価値の最大化を同時に追求します。プロダクトマネージャーは、もっとも重要な課題探索（Discovery）と事業成果（Outcome）に集中し、少人数の自律的なチームでプロダクトを前進させます。

メルカリのミッション・バリューについての詳細はこちらをご覧ください。

業務内容

プロダクトマネージャーとして、メルカリShopsおよびB2C新規サービスの戦略策定から実行までを担い、エンジニア・デザイナー・データアナリスト等で構成されるクロスファンクショナルなチームをリードしていただきます。AIを活用した開発体制のもと、課題探索から事業成果までを一気通貫でオーナーシップを持って推進します。

主な業務詳細

1. ビジョン・戦略・ロードマップの策定

メルカリShops / 新規サービスのあるべき姿を定義し、中長期のビジョンと実行可能なロードマップを策定する
定量/定性データ・市場/競合動向にもとづき、経営陣や関連部門と合意形成を行いながら、事業成長に直結する優先順位を決定

2. Discovery（課題探索）と高品質なバックログ生成

定量・定性・市場・競合などの多様なインプットを統合し、検証可能な仮説と成功条件を備えた高品質なプロダクトバックログを継続的に供給
生成AIを活用して調査・プロトタイピングを高速化し、検証サイクルを速く回す

3. プロダクト開発のリード

エンジニアが開発をE2Eで主導する体制のもと、PdMは仮説検証と重要な意思決定に集中
エンドユーザー向けのメルカリApp / Webにとどまらず、ショップ運営の現場で日々使われる管理画面の各種管理機能（在庫・注文・販促など）や公開APIなど、多岐にわたるプロダクトを継続的に改善・拡張する。

4. Launch & Learning（届く・使われる・学べるの設計）

リリースして終わりにせず、Push/プロモーション/PRを含むGTM設計、関連部門（マーケティング/CRM/CS等）との連携を主導
リリース後のグロースと長期影響をモニタリングし、Next Actionを設計

5. ステークホルダーとの連携・合意形成

Sales / BizDev / CS・Trust&Safety / 法務 / リスク・コンプライアンス、マーケティング・CRM、グループ各社との要件調整・優先度判断、ならびに経営層へのレポーティングと合意形成

業務内での利用ツール例

汎用チャット/生成AI: Gemini、Claude
ナレッジQA/リサーチ支援: Notion AI、NotebookLM（資料アップロード＋Q&A）
開発支援（コード補完・コーディングエージェント/IDE）: Cursor、GitHub Copilot、Claude Code、Devin、Codex、Gemini Code Assist
ワークフロー自動化/AIアプリ開発（ノーコード/ローコード）: n8n、Dify

ユニークなチャレンジ

これまでC2Cマーケットプレイスとして成長してきたメルカリにおいて、B2Cのお客さま体験を通じて購入者と事業者・ブランドをつなぎ、マーケットプレイスとして提供できる価値をさらに高めていく挑戦です。
メルカリは月間2,300万人ものお客さまを抱えており、その規模のお客さまに対して新しい価値を提供・提案できることは、他ではなかなか実現できないこのポジションならではの魅力です
AIを前提とした開発体制のもと、動くプロトタイプを起点にチームの議論と意思決定の解像度を高めながら、PdMが本来集中すべきDiscoveryとOutcomeに注力できる環境です。データ基盤やプロダクト開発にとどまらず、新たな顧客体験の企画・推進まで、幅広い裁量を持ってプロダクトを前進させられます。
成果次第で任される範囲は大きく広がり、最終的には「一つのプロダクト」ではなく「一つの事業」を動かす経験ができるポジションです。

応募要件