Abstract: Today’s superconducting qubit devices are highly sensitive to noise, making them sensitive probes for axion and particle-like dark matter. While useful quantum computing with these devices is still years away, these devices have already been used to set world-leading limits for some types of dark matter. Our group at Fermilab uses an open source toolchain for designing and simulating our devices that includes Qiskit Metal, the SQUADDs library, and also G4CMP, which is a part of the Geant4 toolkit developed and used by particle physicists. In this talk I will survey the types of devices we are interesting in simulating, the particular properties that are of most interest to us, and our near-term strategy to making progress in this design space using open source tools.