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What's the most frustrating 'legacy system' horror story you've encountered where documentation was lost, original engineers retired, and you had to reverse-engineer a working process from scratch?

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Hey there! I've been thinking about those nightmare scenarios we all dread in tech - you know, when you inherit some ancient system that's been running for decades, but there's zero documentation, the original developers have long since retired, and you're left staring at a black box that somehow still processes millions of dollars in transactions. I'm curious about your worst experience with this kind of situation.

What was the system supposed to do? How old was it, and what language was it written in? Did you have to literally reverse-engineer everything by running tests, analyzing outputs, and piecing together the business logic from scratch? How long did it take you to figure out what was actually happening, and what was the most bizarre or unexpected thing you discovered about how it worked?

I've heard stories about COBOL systems from the 80s, custom-built accounting software with no source code, or even hardware-dependent systems that only work on specific ancient servers. What was your personal 'legacy system horror story' that made you question your career choices?

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