Integrated optomechanical systems provide a powerful platform for quantum-coherent sensing and transduction between optical and microwave domains. This functionality relies on a shared mechanical mode—often coupled to a piezoelectric layer—that mediates the exchange of information between photons and phonons. A central challenge in such hybrid systems remains residual heating, which continues to limit their quantum performance. In this talk, we present recent advances addressing this issue through the development of two-dimensional optomechanical crystals featuring enhanced thermal anchoring and gigahertz mechanical modes compatible with superconducting qubits. Two distinct geometries will be discussed as representative examples. We also introduce a dissipation-based coupling scheme operating in the sideband-resolved regime, achieving record-high mechanical frequencies and coupling rates. Together, these results advance the prospects of robust quantum transducers and long-lived optomechanical memories, paving the way toward hybrid photonic interfaces and optomechanical quantum repeater nodes for future quantum networks.