Case Study

Making the Invisible Visible: Designing for Longitudinal Health Insight & Behavior Change

A patient-centered system that builds longitudinal understanding and supports a care loop for thyroid management.


Lead Product Designer | End-to-End Research | AI-assisted Longitudinal Insight | Hypothyroidism Prototype

Impact at a Glance

↓ Reduction in manual tracking burden: 80%
    ↓ Reduction in manual tracking burden: 80%
      ↓ Reduction in manual tracking burden: 80%
        Users identified new health patterns: 91%
          Users identified new health patterns: 91%
            Users identified new health patterns: 91%
              ↑ Medication adherence improvement: +28%
                ↑ Medication adherence improvement: +28%
                  ↑ Medication adherence improvement: +28%
                    ↓ Reduction in clinical data review time: 40%
                      ↓ Reduction in clinical data review time: 40%
                        ↓ Reduction in clinical data review time: 40%
                          Would share app with their provider: 91%
                            Would share app with their provider: 91%
                              Would share app with their provider: 91%
                                Kirsten Duell

                                User research and competitive analysis across thyroid, menstrual, and health tracking apps revealed a gap in flexible, AI-assisted symptom entry with long-term tracking and seamless coordination with care.

                                About Me

                                Hi, I’m Kirsten Duell, a Senior Product Designer specializing in visual systems and AI-assisted experiences for high-stakes domains.

                                I design products that turn fragmented, complex information into clear, usable context—supporting human judgment rather than replacing it. My work spans healthcare and enterprise SaaS, where timing, trust, and accountability are tightly coupled, and where visual design plays a critical role in how signals are interpreted and acted upon.

                                Alongside my healthcare UX work, I bring 10+ years of experience designing end-to-end, enterprise-grade SaaS products, including AI-assisted platforms that secured seed funding and long-term service contracts. I’ve led visual and product design for complex data systems, shaped human-in-the-loop AI workflows, and partnered closely with product and engineering teams to deliver solutions that scale responsibly.

                                With a background in medical product development at Abbott Laboratories and UC Irvine, and certification in HIPAA compliance, I’m experienced designing within regulated environments. I view compliance not as a limitation, but as a core design input—one that sharpens clarity, responsibility, and system integrity.

                                I’m also comfortable working close to implementation, having front-end engineered products and collaborated directly in code environments when needed.

                                Outside of work, I enjoy studying longitudinal data from health metrics and wearable data to skiing performance and sleep patterns, as a way to better understand how systems, feedback loops, and behavior evolve over time.

                                Thank you for taking the time to review my work. I enjoy connecting with thoughtful product and design leaders and discussing how careful, human-centered design can reduce cognitive burden, preserve trust, and improve outcomes in complex systems.