Systems, methods, and storage media for creating secured computer code from original computer code are disclosed. The secured computer code is created from original computer code and has a secured interface between a first code domain and a second code domain of the original computer code, the first code domain including code in a first coding language and the second code domain including code in a second coding language, the first code domain being compiled separately from the second code domain. Exemplary implementations may: identify a code method defined in the first code domain that is declared in the second code domain; create a corresponding code method in the second code domain that has a signature that corresponds to a signature of the code method; and create a transformed code method in the first code domain.