Most articles about GDPR are written by lawyers for lawyers. This one is written by a developer for developers — with real code, real mistakes, and real consequences. I've built several B2B SaaS products in Europe. Billing platforms, webhook inspectors, hotel management systems. Every single one had to deal with GDPR in some form. And every single time I talked to other developers about it, the conversation went one of two ways: Either "we just added a cookie banner and called it done" — or pure panic, because someone realized they'd been copying production data into staging for two years. Neither response is correct. GDPR is not a checkbox. It's a set of engineering constraints that affects your schema design, your logging, your test data, your third-party integrations, and your deletion logic. If you treat it as a legal problem, you'll handle it wrong. It's an engineering problem. Let me walk you through what it actually means in code.…