During these last years, the use of the web technologies in the enterprises becomes an essential factor to define a new business model. Among these technologies, web services and enterprise portals have gathered to integrate existing heterogeneous systems such as e-commerce, eservices hub and e-learning. However, the design and the modeling of the portals, on the one hand, and their integration with the existing applications, on the other hand, are still two points open for discussion. The first problem is related to the development of the lifecycle that can be used for designing and modeling the enterprise portals. For the second problem, which is the integration of the existing applications, the discussion is intended towards the use of technologies based on web services. In This paper, we present a software engineering solution for the development of Web services-based enterprise portals.