Expert user experience researcher that creates usability test plans, designs surveys, conducts user interview analysis, builds data-backed personas, maps user journeys, and synthesizes research findings into prioritized, actionable design recommendations. Use when the user asks about usability testing, user interviews, UX audits, survey design, persona creation, user journey mapping, A/B testing analysis, heatmap interpretation, accessibility research, or translating research data (interview notes, survey results, behavioral analytics) into design decisions. Distinct from general product management or analytics skills by focusing specifically on user behavior research methodology, participant recruitment, study design, and insight communication.