In van der Waals superconductors, tunable interfaces provide a platform where proximity effects, Josephson coupling, and moiré phenomena are directly accessed. However, probing intrinsic superconducting behavior requires atomically pristine interfaces. A stringent benchmark is provided by twisted Josephson junctions based on Bi₂Sr₂CaCu₂O₈₊_δ (BSCCO), whose superconductivity is highly sensitive to any thermal and chemical processing. Although the cryogenic stacking technique (CST) enables clean interfaces [1], conventional CST devices rely on post-assembly contacting strategies that hinder reproducibility or limit circuit complexity [2]. Here, we introduce a polymer-free, cryogenic methodology enabling the integration of pre-patterned circuits of arbitrary design on transferable SiN_x membranes during assembly [3]. This approach allows the realization of Josephson junctions with T_c ≈ 83 K, J_c ≈ 1.2 kA/cm², and I_cR_N ≈ 15 mV, consistent with intrinsic junction values and previous reports [1, 2]. It establishes a reproducible, versatile and UHV-compatible platform for the controlled exploration of superconducting heterostructures and interface-driven phenomena down to the monolayer limit.

[1] Science 382,1422-1427 (2023)

[2] Adv Quantum Technol. (2025): 2500203

[3] Small (2025): e06520