This course covers principles, techniques, architectures, and enabling technologies for the development of the different components and layers of complex e-Commerce systems (presentation and personalisation layer, business logic, message exchange). In particular, it discusses the processes related to (1) building a large enterprise system in collaboration with other project members, (2) developing software in a culture of participation, (3) developing software using agile software engineering methodologies, (4) integrating a number of separate components to build an integrated system, and (5) developing appropriate testing strategies and methodologies for given projects.