In almost every established enterprise, there’s THAT one system. It’s the one running in the corner, performing a critical function for years. It’s reliable, but it’s also a complete black box. No one wants to touch it for fear of breaking it, and the original developers are long gone. It could be a core banking ledger from the 90s, a logistics routing engine in a warehouse, or a data aggregator on a factory floor. You know it works because, well, it hasn’t failed… yet.
