Workflows and service oriented computing (SOC) are an integral part of today’s business scenarios. The SimTech project aims to leverage these proven technologies in the context of scientific research. Yet, this field of eScience has different requirements on SOC than their business counterparts. One of these differences is, that services and resources needed by scientists are commonly only required for very specific amounts of time and do not need to follow the always-on principle of traditional SOC. Thus, a means is necessary to make services and resources available when required and also free them again as soon as they are no longer needed. As a solution to utilize SOC in eScience scenarios, SimTech promotes the use of Cloud Technologies to enable the on-demand provisioning of services and their necessary infrastructure. This diploma thesis is focused on describing different architectural concepts and designs that enable the on-demand provisioning of services and their underlying infrastructure and middleware. These designs and concepts aim to strike a middle ground between abstract high-level architectures and very low-level architectures that focus solely on software specifics. The concepts have been designed in context of a Scientific Workflow Management System. A prototypical implementation that demonstrates the developed concepts concludes this thesis.