Collaboration of system designers and social researchers to search for solutions to social problems is becoming increasingly important. In this context, G@together project funded by JPI-Urban Europe is an interdisciplinary project aiming to build an e-platform facilitating the employment of qualified but disadvantaged people. The use of qualitative social data and the participation of end-users to the system design process provide a significant potential for co-creation studies. In this study we used different social research and system engineering techniques to elicit the requirements of different stakeholders concerning an e-recruitment platform. These methods helped the collaboration of system designers, social researchers and user groups to prioritize the system requirements. Analytic Hierarchy Process, a commonly used multi-criteria decision making technique is used to integrate the different elements of this process.