Coded infrastructure impacts city life, in ways that can largely be unconscious. Codes do not necessarily have to be imposed on the city from outside of it. They may emerge from within the city, and by doing so demonstrate different ways of constructing urban experience. Coding can be sense making, and building coded infrastructures can in turn require sense making – including decisions about how the code work should t into a particular urban space, and how it ought to be managed and sustained. This chapter develops a perspective on peer-to-peer engagements on the coded city by analysing how coding practice is related to the development of other social and cultural ‘codes’ that propose alternative ways of integrating technology into space. It argues that peer-to-peer coded cities are most signicant because they suggest alternative ways of governing the interface between technology, the social and the spatial.