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

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) - Mercari Marketplace

• 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 about 24 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

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