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Money crosses every layer of my systems: database, services, JSON, browser and printed documents. I keep one convention everywhere — amounts are integers in the currency's minor unit, as ISO 8583 carries them, named with a suffix, rounded in one place and converted only at the edges.
Salary tables, salary steps, promotion, retirement age and allowances are set by regulations that keep changing. I read the regulations themselves, store what they change as data with an effective date, and keep the arithmetic in code that cites its legal basis.
My code is read by people who were not there when it was written: colleagues, me months later, or an AI agent that forgets on every reset. The clean code rules from Robert C. Martin I apply in every language, shown in a Rust service.
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