Senior Product Designer leading end-to-end user experience design for Mercari's Japanese marketplace. Collaborates with teams to shape problem spaces and define design quality.
Responsibilities
Own the end-to-end design for buyer-facing experiences, from discovery and problem framing through execution and launch.
Act as Lead Designer for assigned product areas, setting experience direction and design quality standards.
Translate ambiguous business and user problems into clear experience strategies, flows, and high-quality UI.
Drive design decisions through strong craft, systems thinking, and user-centered rationale.
Collaborate deeply with PM, Eng, and UXR to shape product direction and influence roadmaps.
Identify gaps and opportunities beyond the immediate scope and proactively propose new ideas, concepts, or improvements.
Contribute to and evolve shared design systems, patterns, and best practices.
Provide thoughtful feedback and mentorship to other designers, raising the overall quality of work.
Requirements
6+ years of experience in product, UX, or interaction design with ownership of end-to-end experiences.
Strong craft skills across UX, interaction design, and visual design, with a sharp eye for detail and quality.
Proven ability to lead design for complex or ambiguous problem spaces.
Experience influencing product direction through design thinking, concepts, and storytelling.
Solid understanding of design systems, scalable patterns, and consistency at scale.
Strong collaboration and communication skills with cross-functional partners.
A portfolio demonstrating high-quality shipped work, problem-solving depth, and design leadership.
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