The billing module was written by Marcus.
Marcus was a senior engineer who understood the entire business domain deeply. He left for a startup in 2017.
His code works—most of the time. When it doesn't, nobody knows why.
The variable names are cryptic. The comments explain what the code does (poorly) but not why.
The business logic is embedded in 47 nested if-statements. There are no tests.
Every time someone touches it, something unexpected breaks. After three incidents, the team has an unofficial rule: don't touch the billing module.
Bug reports pile up. Feature requests get rejected.
The product works around limitations rather than fixing them. New engineers are warned away from the code.
It becomes organizational folklore—'here be dragons.' Meanwhile, that legacy code is often mission-critical. It handles payments, or authentication, or some other function that keeps the business running.
The fear of touching it isn't irrational—it's a response to real risk. The solution isn't just courage; it's building the knowledge and safety infrastructure to evolve legacy code responsibly.
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