[AznHisoka]

Yes, you can start, but once your app matures and you rely on it for production, you definitely need an engineer that you can rely on if things blow up.

I know companies that don't rely on any hosted cloud services for our infrastructure, and have just 1-2 people they rely on to be that infrastructure guy, and even they are not 100% full-time. It's only when things blow up that they tell him to stop what he's currently doing, and address the issues. Unless you have 10K+ employees, you'll be hard pressed to find companies that have full-time engineers that just twiddle their thumbs, and stare at a monitoring dashboard 40 hours a week to monitor a component.