How to attend experiential values of a design throughout the imple- mentation is still an open issue. The interplay between experience design and software engineering is problematic because of the different epistemologies of design and engineering. Interaction design is a design practice, whereas soft- ware engineering describes itself as engineering and science. There is a long tradition in design of discussing materials and the craft of making artefacts. Thus, if we have a material, it is reasonable to say that we have a craft. If pro- gramming language code is a design material, then, making a finished artefact is the shaping of material. The development process can thus continue as a de- sign process up to version 1.0. This paper presents a design case up to version 1.0 of a music creativity app, utilising design through programming. The app design validity was evaluated in a field study at an electronica music festival. Material consciousness of code, and an open-ended, and quality-driven design process allow attention to the experiential qualities of the design.