Jookia focused on stabilizing core system components across analogdevicesinc/linux and savonet/liquidsoap, addressing critical bugs in embedded and runtime environments. In analogdevicesinc/linux, Jookia resolved a device-tree parsing issue in the Audio Graph Card driver, ensuring the kernel no longer waited for absent resources during boot, which improved reliability for device-tree driven initialization using C and kernel development skills. In savonet/liquidsoap, Jookia corrected CAMLparam macro usage in OCaml C FFI stubs, aligning parameter counts to prevent runtime errors and crashes. The work demonstrated depth in debugging and maintaining low-level system code, emphasizing correctness and long-term maintainability.