Despite many recent successful achievements in superconducting quantum computer consisting of about a hundred qubits, it is not straightforward to further scale up the system to the level that it can perform some useful tasks. For example, the number of coaxial cables, which is larger than one per a qubit in the current system, must be drastically reduced considering the limitation of inner space and cooling power of a dilution refrigerator. In our Moonshot project [1], we aim to develop break-through technologies which solve those bottlenecks hindering the large-scale integration in superconducting quantum circuits. In the presentation, I will talk about some of our achievements in the project. We have developed multi-chip stacked module, which we envision to use as a quantum version of a system in package. We have also developed standard cell libraries for single-flux quantum circuits for the operation at 10 mK [2], and thus can be integrated into the package in the future. I will also introduce our superconducting quantum computer using the dilution refrigerator developed in our project, which was released on the cloud at the Osaka Expo.