System design interview question
"Design an attendance system for a company with fifty thousand employees across offices, factories, and remote work. It records when people start and stop work, feeds payroll, and enforces labour rules like mandatory breaks and overtime limits. Some employees will try to cheat it, and payroll cannot be wrong."
correctness under adversarial users with legal consequences. This sounds like a simple CRUD system and is not: the data drives payroll and legal compliance, the users have incentives to manipulate it, and the rules vary by jurisdiction in ways that cannot be hardcoded. The discriminating signal is treating time records as an auditable ledger rather than editable rows.
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