It all depends on the team size and the where the company is at. We're a 2 member team and for all intents and purposes code quality takes a backseat. It's not outright ignored but there are a few shortcuts that i take that will hopefully not bite us. All in the interest of shipping things faster. I end up refactoring code at nights after we've pushed to the app store.

In a previous startup that I worked in code quality was outright ignored and I saw first hand the kind of technical debt that builds up because of this.