Nobody warns you about this part. You spend weeks - sometimes months - thinking about your app's features, your onboarding flow, your color palette, whether the button should say "Get Started" or "Sign Up Free." You obsess over the product. You should. That is your job as a founder. But there is an entire layer sitting underneath all of that work which most founders do not think seriously about until the moment it becomes a crisis. And crises in this particular layer tend to happen at the absolute worst time - right after a successful launch, right when a post goes viral, right when an investor is sitting down to try your product for the first time. That layer is hosting. Where your app actually lives. The servers, the infrastructure, the environment that determines whether your product behaves the way it should when real people show up in real numbers. It is invisible when it is working well. It is catastrophically visible when it is not.…