Haruto Matsushima.
Product Designer.
Thinking in systems. Designing for real human behavior.
Building Mutua — where serious language partners meet
Researched why runners train alone even when they'd prefer company — then designed a compatibility-matching system that lowers the social friction of joining a group.
Investigated why student group projects fail before they start — then used Lean UX to design a team formation flow that matches students by goals, working style, and availability.
Enhanced the fan experience through heuristic evaluations and real-user testing to uncover and solve key usability issues.