The evolving landscape of digital health and Human-Computer Interaction (HCI), one principle is becoming increasingly clear: meaningful innovation in mental health cannot happen without the voices of those who live it every day. This fireside chat brings together two leading voices at the intersection of design, lived experience, and digital mental health to explore a critical paradigm shift—from designing for people with mental health challenges to designing with them. Drawing on deep expertise in participatory design, clinical practice, and personal experience, this intimate conversation will unpack the transformative impact of co-designing mental health technologies with individuals who have firsthand knowledge of the system’s strengths, gaps, and nuances. Topics will include ethical engagement, inclusive design practices, the emotional labor of co-design, and the tangible benefits of authentic collaboration—both for product effectiveness and for social justice. Attendees will leave with practical insights and inspiration to center lived experience not as a checkbox, but as a catalyst for creating more empathetic, empowering, and effective digital health solutions.