Senior Product Designer - Mercari / Crossborder

📍 Job Overview

Job Title: Senior Product Designer - Mercari / Crossborder

Company: Mercari, inc.

Location: Minato City, Tokyo, Japan

Job Type: FULL_TIME

Category: Product Design / User Experience

Date Posted: 2026-08-31

Experience Level: 6+ years

Remote Status: Hybrid (Office: Roppongi)

🚀 Role Summary

• Drive end-to-end product design for buyer-facing experiences in a global marketplace context, requiring a strong understanding of user-centered design principles and scalable solutions.

• Lead design initiatives for ambiguous problem spaces, translating complex business and user needs into intuitive and high-quality user interfaces and flows.

• Collaborate deeply with Product Management, Engineering, and User Experience Research (UXR) to influence product strategy and roadmaps, ensuring a cohesive and impactful buyer journey.

• Contribute to and evolve shared design systems, patterns, and best practices to maintain consistency and elevate design quality across the Mercari platform.

• Provide design mentorship and feedback to junior designers, fostering a culture of continuous improvement and raising the overall craft and quality of the design team's output.

📝 Enhancement Note: While the primary focus is product design, the integration with "Crossborder" and "logistics network and efficient operations" suggests a need for designers to understand the operational complexities of international e-commerce, including how design impacts logistics, payments, and regulatory compliance. This role is not just about user interface but about designing the entire buyer journey within a global context.

📈 Primary Responsibilities

• Own the complete design lifecycle for buyer-facing features, from initial problem identification and framing to final execution and launch.

• Serve as the Lead Designer for designated product areas, establishing clear design direction and upholding rigorous quality standards.

• Transform vague business objectives and user challenges into well-defined experience strategies, detailed user flows, and polished user interfaces.

• Champion design decisions through exceptional craft, a robust understanding of systems thinking, and compelling user-centered rationale.

• Foster deep collaborative relationships with Product Managers, Engineers, and User Researchers to shape product vision and impact development priorities.

• Proactively identify design gaps and opportunities beyond the immediate project scope, generating and proposing innovative ideas and enhancements.

• Actively contribute to the development and refinement of shared design systems, reusable patterns, and established best practices.

• Offer constructive feedback and guidance to fellow designers, thereby elevating the collective quality of design work.

📝 Enhancement Note: The emphasis on "designing for large-scale, real-world marketplace complexity" and "balancing speed, experimentation, and innovation with a high bar for craft, trust, and usability" indicates that this role requires a pragmatic approach. Designers must be adept at making trade-offs, prioritizing effectively, and delivering solutions that are both innovative and reliable within a fast-paced, evolving global e-commerce environment.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating equivalent practical experience and mastery of design principles is paramount.

Experience: 6+ years of professional experience in product design, UX design, or interaction design, with a proven track record of owning and shipping end-to-end user experiences.

Required Skills:

• Product Design: Comprehensive experience in designing digital products, from concept to launch.

• UX Design: Deep understanding of user experience principles, user flows, information architecture, and user journey mapping.

• Interaction Design: Expertise in defining how users interact with a product, creating intuitive and efficient interfaces.

• Visual Design: Strong aesthetic sensibility, with a sharp eye for detail, typography, color theory, and layout to create visually appealing and brand-aligned interfaces.

• Design Systems: Proven ability to work with, contribute to, and advocate for design systems to ensure consistency and scalability.

• Problem Framing: Skill in identifying, defining, and structuring complex or ambiguous problems to ensure the right solutions are pursued.

• User-Centered Design: A consistent practice of grounding design decisions in user needs, research, and testing.

• Prototyping: Proficiency in creating interactive prototypes to test and communicate design concepts effectively.

• Cross-functional Collaboration: Demonstrated ability to work effectively with Product Managers, Engineers, Researchers, and other stakeholders.

• Marketplace Design: Experience or a strong understanding of the unique challenges and opportunities within marketplace platforms.

• E-commerce: Familiarity with e-commerce principles, user behaviors, and transaction flows.

• Design Leadership: Capacity to lead design efforts, influence product direction, and mentor other designers.

• Systems Thinking: Ability to understand and design for interconnected components and their impact on the overall system.

• User Research: Understanding of user research methodologies and how to apply insights to inform design decisions.

• UI Design: Crafting high-fidelity user interfaces that are both functional and aesthetically pleasing.

Preferred Skills:

• Experience designing for marketplace, e-commerce, or transaction-based products.

• Experience acting as a lead designer across multiple teams or complex initiatives.

• Familiarity with user research methods and applying insights to design decisions.

• Experience working in or designing for the Japanese market, understanding cultural nuances.

• Comfort experimenting, prototyping, and iterating quickly in uncertain environments.

• Conversational Japanese proficiency (CEFR – A2 level).

📝 Enhancement Note: The requirement for "6+ years of experience" and the emphasis on "leading design for complex or ambiguous problem spaces" and "influencing product direction" suggest this role is more than just an individual contributor. Candidates should highlight instances where they have taken initiative, driven strategy, and demonstrated leadership potential beyond task execution. The "conversational Japanese proficiency" preference is a significant differentiator for roles involving the Japanese market.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Shipped Work: A robust collection of high-quality, shipped product designs that demonstrate end-to-end ownership and impact.

• Problem-Solving Depth: Case studies detailing complex user or business problems, the design process undertaken, and the rationale behind key decisions.

• Design Leadership: Examples showcasing instances where the candidate has led design initiatives, influenced product strategy, or mentored other designers.

• Systems Thinking: Demonstrations of how designs integrate with or contribute to larger design systems or product ecosystems, ensuring scalability and consistency.

• Craftsmanship: High-fidelity examples of UI design, interaction design, and visual design, showcasing attention to detail and a strong aesthetic.

Process Documentation:

• Workflow Design & Optimization: Showcase how you map out user journeys, create detailed user flows, and optimize existing processes for better user experience and efficiency.

• Implementation & Automation: Illustrate how your designs are translated into development-ready specifications and how you consider efficiency in the implementation phase.

• Measurement & Analysis: Provide examples of how you define success metrics for your designs and how you use data (or propose to use data) to analyze performance post-launch and iterate.

📝 Enhancement Note: For this Senior Product Designer role, the portfolio is critical. It should not just show what was designed, but why. Candidates should prepare to articulate their design process, including how they framed problems, conducted research, iterated on solutions, and measured success, especially in ambiguous or complex environments. Demonstrating an understanding of design systems and their application at scale is also key.

💵 Compensation & Benefits

Salary Range: For a Senior Product Designer role in Tokyo, Japan, with 6+ years of experience, the estimated annual salary range is ¥9,000,000 - ¥14,000,000. This range accounts for the cost of living in Tokyo, the seniority of the position, and industry benchmarks for tech and design roles in Japan.

Benefits:

• Full Flextime: Flexible working hours with no core time, allowing for greater work-life balance and personal schedule management.

• Health Insurance: Comprehensive health and dental insurance coverage.

• Retirement Plans: Potential for retirement savings plans or pension contributions.

• Paid Time Off: Generous paid vacation days, public holidays, and sick leave.

• Professional Development: Opportunities for training, workshops, conferences, and access to learning resources to enhance design skills and industry knowledge.

• Commuting Allowance: Support for transportation costs to the office.

• Employee Stock Options/Grants: Potential for equity participation in the company's growth.

• Wellness Programs: Initiatives focused on employee well-being, such as gym memberships or mental health support.

Working Hours: Full flextime with no core time, typically translating to around 40 hours per week, with flexibility to manage personal schedules.

📝 Enhancement Note: The salary estimate is based on research of Senior Product Designer roles in Tokyo, Japan, considering the company's industry (tech/e-commerce), and the experience level specified (6+ years). A range is provided to reflect variations in candidate experience, specific skill sets, and negotiation. Benefits are inferred based on standard offerings for full-time positions at established tech companies in major global cities.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / E-commerce / Marketplace. Mercari operates in the rapidly evolving digital marketplace sector, connecting buyers and sellers globally. This industry demands agility, innovation, and a deep understanding of user behavior and trust.

Company Size: Mercari is a significant player in the tech industry, likely employing several thousand individuals globally across its various operations and product lines. This scale implies established processes, but also opportunities for impact within specialized teams.

Founded: Mercari was founded in 2013. Its relatively young age within the tech landscape means it likely fosters a dynamic, growth-oriented culture, balancing rapid expansion with the need for robust operational frameworks and a strong mission-driven approach.

Team Structure:

• Operations Team: The "Crossborder team" and "New Business Design Team" suggest a structure focused on global expansion and new product development. This team likely comprises Product Managers, Engineers, Designers, Researchers, and Business Development specialists.

• Reporting Structure: The Senior Product Designer will likely report to a Design Lead or Head of Design, working closely with Product Managers and Engineering Leads within the Crossborder or New Business Design divisions.

• Cross-functional Collaboration: Collaboration is paramount, with designers working daily with PMs to define strategy, Engineers to implement designs, and UXR to validate user needs. Business Development and Operations teams are also key partners, particularly for cross-border initiatives.

Methodology:

• Data-Driven Insights: The company emphasizes using data to understand user behavior and market trends to inform product and design decisions.

• User-Centricity: A core tenet is "Circulate all forms of value to unleash the potential in all people," indicating a deep commitment to user needs and empowerment.

• Agile Development: Given the tech industry and focus on rapid deployment, an agile or iterative development methodology is highly probable, requiring designers to be adaptable and responsive.

• Design System Adoption: The mention of contributing to and evolving shared design systems points to a structured approach to design consistency and efficiency.

Company Website: https://www.mercari.com/ (Global) and https://careers.mercari.com/en/ (Careers)

📝 Enhancement Note: Mercari's mission and values, particularly "Circulate all forms of value to unleash the potential in all people," are central to its culture. Designers are expected to embody this by creating experiences that empower users and facilitate value exchange. The "Crossborder" aspect specifically highlights a global, interconnected approach, demanding sensitivity to diverse user needs and market conditions.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior Product Designer role, signifying a mid-to-senior level position. It demands significant autonomy, ownership, and the ability to lead complex projects. The role requires not just execution but also strategic contribution, problem framing, and mentorship.

Reporting Structure: The Senior Product Designer will likely report to a Design Manager or Director of Design. They will work closely with Product Managers and Engineering Leads, acting as the primary design voice for their product area and contributing to broader design team discussions and initiatives.

Operations Impact: The Senior Product Designer's work directly impacts user acquisition, engagement, retention, and transaction volume. By creating clear, trustworthy, and delightful buyer experiences, they contribute significantly to Mercari's revenue growth and market expansion, especially in the complex cross-border e-commerce space. Their designs influence how users discover value, make purchasing decisions, and build trust in the platform.

Growth Opportunities:

• Design Leadership: Progression to Lead Designer, Design Manager, or Principal Designer roles, with increased scope and responsibility for design strategy and team management.

• Specialization: Deepen expertise in specific areas such as marketplace dynamics, global product strategy, or advanced UX research and strategy.

• Cross-functional Mobility: Opportunities to move into Product Management or related strategic roles, leveraging design thinking and user advocacy skills.

• Mentorship & Skill Development: Formal and informal opportunities to mentor junior designers, lead design critiques, and participate in advanced design training and industry conferences.

• Global Impact: Contribute to high-impact, globally scaled products that reach millions of users, offering a unique career trajectory.

📝 Enhancement Note: The "Senior" title implies an expectation for proactive leadership and strategic thinking. Candidates should look for opportunities to demonstrate how they can not only solve design problems but also identify new problems worth solving and influence the product roadmap. The global nature of the role offers significant opportunities for professional growth on a large scale.

🌐 Work Environment

Office Type: Mercari operates a hybrid work model, with an office located in Roppongi, Tokyo. This suggests a modern, collaborative office space designed to support both focused work and team interaction.

Office Location(s): Roppongi, Minato City, Tokyo, Japan. This is a well-connected and vibrant district in Tokyo, offering good accessibility via public transportation.

Workspace Context:

• Collaborative Environment: The hybrid model and office presence likely foster a culture of collaboration, with dedicated spaces for team meetings, brainstorming sessions, and design critiques.

• Operations Tools & Technology: Access to industry-standard design software (e.g., Figma, Sketch), prototyping tools, and collaboration platforms. The company's tech stack will support efficient design workflows.

• Team Interaction: Opportunities for regular interaction with designers, PMs, engineers, and researchers, both in-person and remotely, facilitating strong cross-functional relationships.

Work Schedule: Full flextime with no core time provides significant autonomy. While the role is hybrid, the expectation is that individuals will manage their time effectively to meet project deadlines and attend necessary in-person or virtual meetings, balancing individual focus time with collaborative sessions.

📝 Enhancement Note: The "Hybrid" work arrangement, with a specified office in Roppongi, indicates that while remote work is possible, there's an expectation of office presence for collaboration and team building. Candidates should clarify the expected frequency of office visits and the nature of in-office days during the interview process.

📄 Application & Portfolio Review Process

Interview Process:

• Application Screening: Initial review of your resume and portfolio to assess qualifications against the job requirements.

• Skill Assessment: For non-engineering roles, this might involve a design challenge or a take-home assignment to evaluate problem-solving and execution skills.

• Interviews: Typically involves multiple rounds with different stakeholders:

  • Hiring Manager/Design Lead: Focus on design philosophy, leadership, mentorship, and overall fit.
  • Cross-functional Partners (PM, Eng): Assess collaboration style, communication, and ability to translate design into viable product solutions.
  • Team Members (Designers): Evaluate craft, process, and cultural alignment.

• Reference Check: Conducted towards the end of the process to verify employment history and performance.

• Offer: Final decision based on interview performance and reference checks.

Portfolio Review Tips:

• Curate Selectively: Focus on 3-5 of your strongest, most relevant projects that showcase end-to-end ownership and impact, particularly in complex or ambiguous areas.

• Structure Case Studies: For each project, clearly articulate:

  • The Problem: What was the challenge?
  • Your Role: What was your specific contribution?
  • The Process: How did you approach it (research, ideation, design, testing, iteration)?
  • The Solution: What was the final design?
  • The Impact: What were the results (metrics, user feedback, business outcomes)?

• Highlight Leadership: Include examples of where you've influenced strategy, mentored others, or driven design initiatives beyond your immediate tasks.

• Demonstrate Craft: Ensure your UI and interaction design examples are polished and clearly communicate your attention to detail and aesthetic quality.

• Prepare to Discuss: Be ready to walk through your portfolio, answer detailed questions about your design decisions, and articulate your rationale.

Challenge Preparation:

• Understand the Context: If a design challenge is provided, thoroughly understand the brief, target users, and business objectives.

• Time Management: Allocate your time effectively across problem definition, ideation, design, and presentation.

• Articulate Your Process: Even in a limited timeframe, clearly communicate your thought process, assumptions, and decisions.

• Focus on Impact: Consider how your proposed solution would drive user engagement or business value.

📝 Enhancement Note: The "skill assessment" note suggests candidates should be prepared for a practical evaluation. For a Senior role, this likely involves a more complex problem or a strategic component, not just basic execution. The emphasis on "ambiguous problem spaces" means interviewers will be looking for how candidates approach uncertainty and define solutions without extensive pre-existing frameworks.

🛠 Tools & Technology Stack

Primary Tools:

• Design & Prototyping: Figma (highly probable for collaboration and design systems), Sketch, Adobe Creative Suite (Photoshop, Illustrator), InVision, Principle, ProtoPie.

• Collaboration: Slack, Jira, Confluence, Miro.

• User Research: UserTesting.com, Lookback, Maze, or internal tools for qualitative and quantitative user feedback collection.

Analytics & Reporting:

• Product Analytics: Amplitude, Mixpanel, Google Analytics, or internal dashboards for tracking user behavior and feature adoption.

• Reporting Tools: Tableau, Looker, or similar BI tools for performance monitoring and data visualization.

CRM & Automation:

• While not directly a designer's primary tool, understanding how CRM (e.g., Salesforce) and marketing automation platforms (e.g., Marketo, HubSpot) integrate with user-facing products can be beneficial for context.

📝 Enhancement Note: While the job description doesn't explicitly list tools, Figma is the industry standard for collaborative design and design system management. Candidates should be proficient in at least one primary design tool and have experience with prototyping and collaboration platforms. Familiarity with analytics tools is increasingly important for designers to understand the impact of their work.

👥 Team Culture & Values

Operations Values:

• Mission & Values Embodiment: A strong emphasis on aligning with Mercari Group's mission ("Circulate all forms of value to unleash the potential in all people") and company values. This means understanding and applying these principles in daily work and design decisions.

• Inclusion & Diversity: Commitment to creating an inclusive environment where everyone's potential is recognized, regardless of background. This translates to designing for diverse user groups and fostering an inclusive team dynamic.

• Empathy: A core value, encouraging team members to deeply understand and connect with users and colleagues.

• Excellence & Craft: A high bar for quality in all aspects of work, including design execution, problem-solving, and collaboration.

• Speed & Agility: The ability to move quickly and adapt to market changes while maintaining quality.

Collaboration Style:

• Cross-functional Integration: Designers work very closely with Product Managers, Engineers, and Researchers, requiring open communication, mutual respect, and a shared understanding of goals.

• Constructive Discussions: Encouraging open dialogue and debate that transcends job roles to find the best solutions for the product and users.

• Knowledge Sharing: A culture that values sharing insights, best practices, and feedback to elevate the team and product collectively.

• Proactive Ownership: Team members are expected to take initiative, identify opportunities, and drive solutions forward.

📝 Enhancement Note: The emphasis on "empathizing with and embodying the mission and values" is critical. Candidates should research Mercari's specific values (often found in their Culture Doc) and be prepared to discuss how they align with their own professional principles and how they would apply them in their design work.

⚡ Challenges & Growth Opportunities

Challenges:

• Global Marketplace Complexity: Designing for a diverse international user base with varying needs, cultural contexts, and technological access.

• Ambiguous Product Areas: Leading design in new or undisclosed product areas where precedents are scarce, requiring strong problem-framing and strategic thinking.

• Balancing Speed & Quality: Navigating the inherent tension between launching features quickly and maintaining a high standard of design craft, trust, and usability.

• Cross-Team Alignment: Ensuring clear communication and alignment across multiple teams and functions while maintaining clear ownership of the user experience.

• Japanese Market Nuances: Designing specifically for the Japanese market requires a deep understanding of cultural expectations, trust-building mechanisms, and user interface preferences.

Learning & Development Opportunities:

• Design System Advancement: Contribute to and learn from a mature design system, enhancing skills in component-based design and scalability.

• Global Product Strategy: Gain experience in developing product strategies for international markets, understanding localization challenges and opportunities.

• Cross-functional Leadership: Develop skills in influencing product roadmaps and collaborating with diverse stakeholders across engineering, product, and business development.

• Mentorship: Opportunities to mentor junior designers and learn from experienced design leaders within the organization.

• Industry Exposure: Potential to attend industry conferences, workshops, and gain exposure to cutting-edge design trends and technologies.

📝 Enhancement Note: The "Unique Challenges" section in the raw job description provides excellent insight into what the company considers significant hurdles. Candidates should be prepared to discuss how they would tackle these specific challenges, leveraging their past experiences and problem-solving approaches.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you had to define a product strategy for an ambiguous problem space. How did you approach it, and what was the outcome?"

• "How do you balance the need for speed and experimentation with maintaining a high bar for design quality and user trust in an e-commerce environment?"

• "Walk us through a complex buyer journey you've designed for a marketplace or e-commerce platform. What were the key challenges, and how did your design address them?"

• "How do you ensure your designs are inclusive and cater to diverse user needs and cultural contexts, particularly in a global product?" Company & Culture Questions:

• "How does Mercari's mission, 'Circulate all forms of value to unleash the potential in all people,' resonate with your design philosophy?"

• "Describe your experience working in a hybrid or agile environment. How do you ensure effective collaboration and communication with remote and in-office colleagues?"

• "What are your thoughts on design systems, and how have you contributed to or leveraged them in previous roles?"

• "How would you approach building trust with users in a new or unfamiliar marketplace environment?" Portfolio Presentation Strategy:

• Storytelling is Key: Frame each case study as a narrative with a clear beginning (problem), middle (process), and end (solution & impact).

• Quantify Impact: Wherever possible, use data and metrics to demonstrate the success of your designs. If direct metrics aren't available, discuss anticipated impact or how you would measure it.

• Show, Don't Just Tell: Use visuals effectively – wireframes, user flows, high-fidelity mockups, and interactive prototypes – to illustrate your design process and final outcomes.

• Be Prepared for Deep Dives: Anticipate detailed questions about your design decisions, trade-offs, and rationale. Practice articulating your thought process clearly and concisely.

• Highlight Leadership & Mentorship: For senior roles, explicitly point out instances where you led initiatives, mentored designers, or influenced product strategy.

📝 Enhancement Note: The interview preparation advice should focus on how to answer questions that probe for senior-level thinking: strategic input, leadership, and navigating ambiguity. Candidates should practice articulating their design process and decision-making frameworks, linking them directly to business and user outcomes.

📌 Application Steps

To apply for this Senior Product Designer position:

• Submit your application through the provided Workable link, ensuring all required fields are completed accurately.

• Curate Your Portfolio: Select 3-5 of your most impactful projects that showcase end-to-end ownership, problem-solving in complex or ambiguous areas, and design leadership.

• Tailor Your Resume: Highlight experience directly relevant to product design, UX, interaction design, design systems, and cross-functional collaboration. Use keywords from the job description. Quantify achievements with metrics where possible.

• Prepare Your Narrative: Be ready to clearly articulate your design process, rationale for decisions, and the impact of your work during portfolio presentations and interviews. Practice explaining how you would tackle the unique challenges of this role.

• Research Mercari: Understand Mercari's mission, values, products, and the specific context of the Crossborder team. Familiarize yourself with their culture doc and career site.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.