It’s the most boring thing of the technical side of the job especially at the more senior levels because it’s so mindnumbingly simple, uses a significant proportion of development time and is usually what ends up having to be redone if there are small changes in things like input or output interfaces (i.e. adding, removing or changing data fields) which is why it’s probably one of the main elements in making maintaining and updating code already in Production a far less pleasant side of job than the actual creation of the application/system is.