A bunch of comments on this post give pretty good advice about what to expect, and if you're in your first commercial job it's probably worth going with the flow. However, one thing I'll add is that it's worth watching out for the "academic bad, commercial practices good" mindset. Keep your eyes open, form your own opinions about what is and isn't working. Don't necessarily kick up a fuss about the things you don't like right now but do file them away for the future.

https://yosefk.com/blog/why-bad-scientific-code-beats-code-f... is an interesting counter-point to some of the usual commercial-vs-academic thinking.