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Mercari

Peer-to-peer mobile marketplace for secondhand goods

Technical Product Manager - AI Enablement

Technical Product ManagementUpdated on Nov 12
Full-timeTokyo, JapanNo salary listed

About the Job

Requirements

  • Demonstrated ownership from discovery through delivered value using AI.
  • Experience using AI tools for research, hypothesis validation, and prototyping, integrating data and user understanding, and improving decision-making quality and speed.
  • Experience owning measurable outcomes rather than feature counts and leading the full discover-build-learn cycle.
  • Experience owning post-release adoption, coordinating across divisions, and learning from actual product use.
  • At least 3 years of product management experience for technical products such as internal tooling, developer platforms, SaaS, or infrastructure.
  • Basic knowledge of software development, including agile, and experience collaborating with engineering teams.
  • Experience deriving insights through data analysis using SQL or similar tools.
  • Japanese proficiency at CEFR B2 or above is required.
  • English proficiency at CEFR B2 or above is required.

Responsibilities

  • Own the strategy and roadmap for how Mercari builds products, defining AI-native tools, practices, processes, and the sequence of change.
  • Use evidence from teams, the market, and experiments to determine priorities, gain agreement from leadership and function leads, and update the plan when stronger evidence emerges.
  • Work directly with product teams across the Group to identify time and quality problems by observing how work is done.
  • Translate findings into prioritized hypotheses with success conditions agreed in advance.
  • Use AI tools to accelerate research, analysis, and prototyping.
  • Build prototypes and working software when these answer questions faster than documentation.
  • Set pilot success criteria with affected teams before pilots begin and evaluate outcomes against those criteria.
  • Select experiments for broader adoption, develop successful tools into platform services, and scale them across the company.
  • Design the path from launch to sustained use, including onboarding, documentation, training, and internal communications.
  • Treat enablement as a product with users, quality standards, and measurable metrics.
  • Track adoption and output quality together and use the results to decide next steps.
  • Partner with Product Management, Engineering, Design, QA, BI, Marketing, Compliance, and Legal to establish shared understanding of changes and team autonomy.
  • Provide leadership with a clear view of current and near-term AI capabilities and their implications for decisions.
  • Use Japanese and English weekly; discussions with function leads and team training are mainly in Japanese, while written materials are provided in both languages.

Desired Qualifications

  • Experience as a technical product manager across multiple domains such as web, mobile, backend, data, or design systems.
  • Experience changing and sustaining how people work outside one's own reporting line.
  • Practical experience with AI tools beyond chat, including supplying context, defining callable agent tools, and evaluating output quality with an evaluation set.
  • Experience in internal products, platform work, developer experience, or developer productivity, especially where teams choose whether to adopt the product.
  • Experience taking an internal product from inception to broad adoption.
  • Experience aligning with Legal, BizOps, leadership, and external partners.
  • Comfort with experiments and metrics, including designing tests, interpreting results, and changing conclusions when evidence warrants.
  • Experience designing internal enablement, training, or technical documentation.

About the Company

Mercari

Peer-to-peer mobile marketplace for secondhand goods

Mercari operates a mobile peer-to-peer marketplace for buying and selling secondhand goods. Users list items by taking photos in the app, and buyers complete purchases there, with payments held in escrow until receipt is confirmed. Revenue comes from seller fees (10% in Japan; 10% plus 3.6% buyer protection in the US), plus Merpay payments and promoted listings, plus shipping partnerships for integrated delivery. The platform differentiates itself through a simple mobile experience, escrow and buyer protection, shipping integration, and a broader marketplace including Mercari Shops for sellers, with a goal of extending product life and supporting a circular economy.

Company size
1,001-5,000
Company stage
IPO
Headquarters
Tokyo, Japan
Founded
2013

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