MIMOSA proposes a novel approach based on the realization of molecular architectures deposited on a superconducting substrate, where spin centers are exchange-coupled through the covalent skeleton of the molecule and interact with the SC charge carriers. The rational design of multi-spin molecular (MSMols) architectures with well-defined magnetic interactions represents an unprecedented tool for clarifying mechanisms underlying the formation of topological qubits in these hybrid architectures. MIMOSA will move the first steps towards the investigation of these MSMol-SC platforms by combining coordination chemistry and surface science methods. Selected polynuclear molecular systems will be synthesized to fabricate multi-spin complexes with different magnetic interactions by tuning the ligands and the central metal ions properties. The long-term goal of developing realizable quantum computing platforms is ground-breaking and expected to impact a broad range of social fields. MIMOSA is strongly interdisciplinary and founded on the cooperation of Research Units, led by two under-40 principal investigators from diverse fields, including synthetic chemistry, surface science, and molecular magnetism.