Process as a Service (PaaS) addresses modeling, execution and management of business processes without running extensive and costly process management software. Such a flexible outsourcing strategy is especially advantageous in the context of mobile devices and services which are increasingly relevant for contemporary business activities. Based on the concept of context-based cooperation, this paper proposes a PaaS solution for mobile participants which enables them to share existing local and remote resources and to utilize PaaS functionality of cooperating providers in a user-defined way. The approach is realized and evaluated by an extended prototype implementation of the DEMAC (Distributed Environment for Mobility Aware Computing) platform.