The heart of the product was permissions, and permissions are invisible until they're wrong. We mapped flows across four roles — patient, family caregiver, professional caregiver, admin — tailoring not just what each could do but what each could see. I designed the iOS appliance flows (activation, session reminders, vitals, messaging) under a hard constraint: an older, non-technical patient had to use it at the bedside without help, and you can't hotfix a physical device the way you patch a web app. On the web side the work ran from the caregiver dashboard through vital signs, the high-consequence medications flow, the Health Center, and the admin onboarding surface — all in the same product language.