It doesn’t need it – your code – it doesn’t need to be defended.
You don’t need to cite why it is excellent, works, and shouldn’t be changed and how the problem must be elsewhere.
Because if it’s running, if it’s doing the thing you built it to do, if it’s scaling, if it’s handling errors and not losing them and if it’s taking a hit but keeps on running.
Then that is all the defense it needs.
