I’ve worked for startups too; everyone does everything all at the same time! Let the chaos reign! But it is fun in its own way.
I work for a large company now after the startup I worked for was acquired. Hierarchy, bureaucracy, layers, we’ve got it all. For worse and for better though, it allows me to focus and specialize on what I’m awesome at and furgeddaboddit (ahem! delegate) the stuff that I suck at to those who excel at those tasks.