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About the Role

As a Product Engineer (PdE), you will take end-to-end accountability for Global Supply — from shaping specifications through production release and the operations that follow — working closely with a Product Manager and other stakeholders. You will be building foundational capabilities for a global marketplace, ensuring that what you ship can be adapted for future markets without extensive rewriting. Your mission is to realize our global marketplace, enabling both individual sellers and businesses to list items that customers worldwide can buy with ease and confidence.

Responsibilities

Drive specification and implementation for foundational capabilities, starting from working prototypes and using running code to finalize specifications.
Own quality, measurement, and release across markets, establishing measurement standards, quality bars, and phased rollout plans.
Make architecture decisions that outlive the feature, deciding what belongs in the shared foundation versus what stays specific to a market.
Take end-to-end accountability from specification through production release and subsequent operations.

Requirements

Resonate with the mission and values of the Mercari Group and of each company.
Ability to lead specification concretization and stakeholder alignment, taking end-to-end responsibility through production release and operations.
Practical AI-assisted development ability, including judging, correcting, and integrating AI outputs safely.
Ability to prototype fast and iterate behavior/requirements using working code.
Autonomous technical design judgment and ability to explain trade-offs in a business context.
Cross-layer learning agility and willingness to cross into adjacent job functions.
Willingness to mentor and coach others, with motivation for organizational growth.
Experience building or migrating systems that serve more than one country, currency, or regulatory environment (preferred).
Experience extracting shared capabilities out of a system originally built for a single market (preferred).
Experience designing APIs or data models consumed by teams you don't control (preferred).
Experience operating what you built after launch (preferred).
Experience collaborating with Product Managers as a peer (preferred).
Knowledge of C2C/B2C marketplaces, commerce, logistics, or cross-border domains (preferred).

Skills

AI-assisted development
Prototyping
Technical design judgment
Cross-layer learning
Mentoring
Coaching
System building/migration
API design
Data modeling
System operation
Collaboration with Product Managers

Location

Roppongi

Work Type

Full-time employee
Flextime (no core hours)

Experience Level

End-to-end responsibility
Cross-layer learning agility

Education Level

Proficient (CEFR B2) or above in English

About the Company

The Mercari Group's mission is to 'Circulate all forms of value to unleash the potential in all people'.
Mercari believes that by circulating all forms of value, we can expand everyone's options and contribute to people and society.
The company aims to realize a global marketplace that creates new value and drives the growth of diverse businesses.
Mercari is building a single commerce foundation shared across all its marketplaces.
Mercari's Engineering Principles include Passion For The Product, Grow Together, Solve Through Mechanisms, and Collaborate Openly.

Equal Opportunity

Mercari aims to realize a society where an individual's potential is not predetermined by their background and everyone has the opportunity to freely create value.
Inclusion & Diversity is indispensable to realizing Mercari's mission.
Mercari promises to eliminate all discrimination based on age, gender, sexual orientation, race, religion, physical ability, or any other attribute in its hiring activities.