COBOL, a language from the 1950s, still processes about 95 percent of all ATM swipes and 80 percent of credit card transactions. That isn't nostalgia, it's because after sixty years of production use, every edge case has been found and fixed. The shiny new replacement might look great on a roadmap, but it's the boring backbone that keeps money moving during peak hours and outages. Sure, it's not sexy, but when a bank's core system needs to never, ever go down, you want the technology that has already been punched in the mouth a million times.
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