The dendrimer chemistry developed in the 80s opened up new perspectives in fields as diverse as catalysis, molecular electronics or artificial photosynthesis. But surprisingly, magnetic dendrimers are not common in the literature due to puzzling difficulties in synthesis and characterizations. In this context, the design of such multimetallic and monodisperse starburst architectures, endowed with magnetic properties, is therefore a real challenge. In the frame of MAGDEN, a multidisciplinary project, we propose to take up this challenge by carrying out the synthesis, characterization (including X-Ray diffraction) and study of magnetic dendrimers. It brings together the dual expertise required (dendrimer chemistry and molecular magnetism) as well as the skills of synthetic chemists, crystallographers, theoreticians and physicists (specialized magneto-caloric effect and in quantum information processing materials). Following a rational modular strategy, we plan to synthesize and then combine spin-carrier hetero-polymetallic building blocks in order to obtain coordination dendrimers with real control over the expected topologies and exchange interactions. The versatility of this approach makes it possible to anticipate the properties according to the choice of metal cations involved in the structure (single molecule magnets or giant spin values, etc.). This type of compound could therefore prove to be extremely interesting for the storage of information, molecular qubits or magnetocaloric effects. Moreover, given our expertise in multifunctional species, chirality, switching or luminescence properties can be integrated into the structure in order to realize photo-magnetic or multifunctional compounds. The project is based on extremely promising preliminary results, (in particular MLn3Co6 and MLn4Co8 dendrimers characterized by XRD) demonstrating the feasibility of our strategy.