Working in startups - especially if they have funding, is definitely not what I'd call boring.
If you're thinking about a startup, you need to be comfortable doing full stack dev, testing, infrastructure, operations, debugging in production, debugging on your local dev, databases both querying and architecture, unit testing, integration testing, functional testing, scalability and being able to be ripped out of whatever it is you're doing that needed to be finished yesterday to debug the server that just went down taking out your primary income stream; and then when it's done and you've high fived a couple of people, you need to be able to sit right back down and get the shit out of the door you got ripped away from to do that.
This is startup life. If you don't like the heat, you'd definitely better stay out of the kitchen.
If you're working in a startup and you're finding it boring, then chances are this startup isn't going anywhere. Time to get your CV out.