Providing Grid users with a widely accessible, homogeneous and easy-to-use graphical interface is the foremost aim of Grid-portal development. These portals, if designed and implemented in a proper and user-friendly way, might fuel the dissemination of Grid-technologies, hereby promoting the shift of Grid-usage from research into real life, industrial application, which is to happen in the foreseeable future, hopefully. Grid portals are quite frequently applied in order to utilize common user tasks like access control, data and application code transfers, job control and status monitoring but design, development and performance tuning of complex Grid or HPC applications are usually not supported directly by such portals. This paper introduces P-GRADE Portal being developed at MTA SZTAKI. It allows users to manage the whole life-cycle of building and executing complex applications in the Grid: editing workflows, submitting jobs relying on Grid-credentials and analyzing the monitored trace-data by means of visualization.