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About the Role

We are seeking an experienced User Researcher to join the New Business UX research function at Mercari. This role requires full-stack research capability—the ability to move fluidly between lightweight tactical research and deeper strategic research, while also leading research initiatives independently and partnering cross-functionally with product, design, and business teams. You will own research strategy for assigned new business initiatives, ranging from early-stage market exploration to validation of emerging concepts.

Responsibilities

Lead end-to-end research initiatives for new business concepts, including framing research questions, designing methodology, managing timelines, and communicating findings to senior leadership and stakeholders.
Conduct international and cross-cultural user research, including planning and executing fieldwork in key markets to understand local user behaviors, market dynamics, and competitive landscapes.
Partner with product, business development, and design leads to translate business hypotheses into rigorous research frameworks that test viability and reduce risk.
Make methodological choices that balance research rigor with business velocity—knowing when to run quick validation tests vs. deeper exploratory studies.
Synthesize research findings into strategic recommendations and business insights that inform go/no-go decisions, product strategy, and market entry decisions.
Establish and evolve research ops best practices for the new business organization, including participant recruitment strategies, repository management, and insight communication frameworks.
Build and maintain research repositories, market databases, and competitive intelligence systems that enable ongoing learning across new business initiatives.
Support research at scale by leveraging AI tools thoughtfully across the research workflow—from study planning and participant recruitment to analysis, synthesis, insight visualization, and reporting.
Help establish shared research artifacts (playbooks, templates, frameworks) that enable rapid research execution and knowledge sharing across the new business team.
Partner with PMs, designers, marketing and business development stakeholders to identify research needs early and embed research into decision-making cycles.
Communicate research findings effectively to diverse audiences—executives, product teams, and design partners—adapting communication style and rigor to stakeholder needs.
Build trust and credibility with stakeholders through transparent research practices, clear methodology communication, and a track record of actionable insights.
Mentor and support junior researchers or contractors as the team grows.
Stay current with research trends, methodologies, and tools—particularly in international research, business model validation, and emerging commerce spaces.
Explore and advocate for thoughtful applications of AI in the research function, helping Mercari develop a more efficient, innovative research practice.
Contribute to the broader UX research community at Mercari, sharing frameworks and learnings across teams.

Requirements

5+ years of UX research experience in-house, agency, consulting, or hybrid roles, with demonstrated ability to lead research independently (not just execute studies).
Proven experience conducting strategic research that has directly informed business decisions or product strategy—you can articulate 2-3 examples where your research shaped direction.
Strong methodological expertise across qualitative and quantitative methods: user interviews, ethnographic research, usability testing, surveys, analytics, concept validation, and A/B testing.
International field research experience: Hands-on experience planning and conducting research across multiple countries/cultures, including in-person fieldwork, ethnographic research, or international market studies.
Research operations and/or strategy experience: Familiarity with research repository management, research planning frameworks, VOC programs, or scaling research across teams.
Excellent communication skills in English (verbal and written) at a professional/executive level—you can distill complex findings into clear narratives for senior leaders.
Competence with AI tools and research technology: Experience using AI for research workflows (synthesis, insight generation, etc.) and familiarity with research tools (UserTesting, Maze, Qualtrics, survey platforms, or equivalent).
Stakeholder management: Experience presenting to and influencing senior stakeholders, translating research into business language, and building buy-in for research-informed decisions.
Full-stack and versatile: Comfortable moving between modes—able to run quick, lightweight validation tests one week and design a rigorous multi-month strategic research initiative the next.
Strategically minded: Able to frame research questions that directly address business risk and opportunity.
Intellectually rigorous: Comfortable defending methodology choices, challenging assumptions (yours and others'), and insisting on evidence-based thinking—even under time pressure.
Operationally savvy: Excited to build research infrastructure and processes—not just execute individual studies, but help create scalability and organizational capability as the team grows.
Internationally experienced: Genuinely curious about cultural differences, local markets, and cross-cultural user research.
Adaptable and entrepreneurial: Thrives in ambiguous, fast-paced environments. Comfortable with incomplete information, shifting priorities, and the inherent uncertainty of new business exploration.
Communicative and collaborative: Strong storyteller who can make research findings memorable, accessible, and actionable.
Comfortable with AI tools: Proactive about exploring and applying AI to improve research speed, quality, and scale—while maintaining research rigor and ethical practices.
Learning-oriented: Brings curiosity about the ecommerce space, new business models, and what drives user adoption in emerging categories.

Skills

UX research
Strategic research
Qualitative methods
Quantitative methods
User interviews
Ethnographic research
Usability testing
Surveys
Analytics
Concept validation
A/B testing
International field research
Research operations
Research strategy
AI tools
Research technology
Stakeholder management
Communication
Storytelling
New market exploration
Business model validation
Ecommerce
Marketplace dynamics
Quantitative analysis

Location

Roppongi

Work Type

Full-time
Full Flextime (no core time)

Experience Level

Senior

About the Company

Circulate all forms of value to unleash the potential in all people
The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world.
We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them.
Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential.
The New Business Design Team leads end-to-end user experience design for emerging product initiatives at Mercari, shaping intuitive, trustworthy, and high-quality experiences for domestic and international users.
We partner closely with Product, Engineering, Research, and Business Development to explore new problem spaces and raise the bar for craft, consistency, and innovation.

Equal Opportunity

Here at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value.
We also firmly believe that a mindset of Inclusion & Diversity is essential for us to achieve our mission.
Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background.