Dermacycle is an iOS app made for an Aestethic Center in Buenos Aires. The app allows you to book / cancel appointments for different skin / health treatmens that you had previously bought (not in-app purchases).
I collaborated side by side with the development team which gave me the documentation with a full description of the sections and needs for each screen. The client would give me feedback and I would make the iterations needed.
This is a very simple app and the process went smoothly. I had been warned that the client might be tough as they were annoying with the details and they had a strong style taste but we had no friction at all. They liked my first approach and I could move forward easily. Surprisingly the most iterations we had were icon-wise as they were thorough with the connotations they might have.