Kat Cormack has over 13 years of experience in digital mental health. She developed the WellHappy app as her first project without any prior app development experience. The process involved focus groups, scoping, identifying stakeholders, and dealing with scope creep and development challenges. The app launched but then faced bureaucracy and issues being supported within the NHS system. Kat then helped develop BuddyApp, which is now used across the UK NHS and beyond. Her lessons learned include understanding the slow NHS bureaucracy, fragmented system, importance of navigators, commissioning cycles, dangers of sole NHS funding, and challenges of proving efficacy to the NHS.