What building a Hospital Management System taught me about software architecture I wish I'd learned earlier

I spent the last two years on the implementation and integration side of a Hospital Management System — and it changed how I think about software architecture more fundamentally than anything I'd worked on before. Not because healthcare software is especially glamorous. It isn't. But because the failure modes are so immediately and visibly consequential that you can't hide behind abstractions the way you can in most enterprise software. When a module fails silently in a billing system, someone's revenue is affected. When it fails silently in a clinical workflow, someone's safety is affected. That difference sharpens your thinking in ways that carrying a pager never quite does. Here's what I actually learned. Coupling is a patient safety issue, not just a code quality issue In most software contexts, tight coupling is a maintainability problem. You'll pay for it eventually, but probably not today and probably not catastrophically. In healthcare software the timeline compresses dramatica