This paper presents a framework and an intranet solution for an electronic market of human competencies to ease the team building process, as well as to support knowledge and competence exchange. This systems should allow to reduce the transaction costs and time requested at the creation stage of a team, and ensure a higher quality of the selection. We examine the difficult issue of competence modeling, present the solutions adopted and propose three market mechanisms for 1) searching and locating the necessary competencies, 2) making calls for bids and 3) negotiating contracts with the pre-selected team members.