When I was young, a family member told me something that I found to be extremely true regardless of whether it's a big company or not and regardless of whether it's tech or not:

Expect your duties in a new job to be "sweeping the floor." Even if you're very experienced, you'll start by doing those more mundane things that others would prefer not to do. The difference between being experienced and not in this regard is how nice the floor you'll be sweeping is.

In a very real sense, it's part of your training.