Not sure why I got down voted for an honest question. Most start-ups are founders, developers, sales and marketing. Dedicated infrastructure, network and database specialists don't get factored in because "smart CS graduates can figure that stuff out". I've worked at companies who held onto that false notion way too long and almost lost everything as a result ("company extinction event", like losing a lot of customer data)

I am always amazed at how little my software dev spouse understands about infrastructure, basic networking troubleshooting is beyond her. She is a great dev, but a terrible at ops. Fortunately she is at a large company with lots of devs, sysadmins and SREs.