Let me describe a conversation that happens way too often. A startup has a working product, growing users, and real traction. Then someone says, "we should probably look at security before we raise our Series A" and the audit comes back with a list of issues that would make a pen tester wince. Tokens stored in AsyncStorage with zero encryption. No certificate pinning. API keys baked directly into the source code. Sensitive user data logged to the console in production builds. These aren't exotic vulnerabilities. They're fundamentals. And they exist because nobody made security a priority at the start. The Cost of Retrofitting Security Is Brutal Early-stage teams move fast - I get it. Security can feel like friction. But the math on fixing it later is punishing. Rebuilding a broken authentication system after you have 50,000 users means data migration, forced logouts, potential breach notifications, regulatory exposure, and weeks of engineering time that could have been avoided.…