This report gives an account of the results of a joint research effort between Tampere University of Technology, Department of Pervasive Computing and University of Applied Sciences and Arts Northwestern Switzerland, School of Engineering. The research was integrated with a seminar participated by PhD students at TUT. The aim was to identify working practices in software startups through interviews and formulate them as patterns. The results consist of the set of 63 found practices, their relationships, and a set of 14 patterns formulated for a selected set of the practices.