When college taught you x,y,z best practices I take it they also defended them with the reasons why right? Why not to cross layers, why x pattern works for y problem. It's good to have confidence in those patterns, especially if you understand them and you must take ownership of your opinion of them. But now other people are going to have their own opinions and you're going to need to parse why they came to those conclusions and a lot of it will boil down to "this was how it was done before and it worked." At this point you might not have the power to override their decisions without making things difficult for you, so just try to follow suit.

For now you need to build and ship whatever lets you keep your job and income going, but keep studying to understand how things should be despite what work will have you do. Keep deepening your understanding of SWE and form opinions on them for when its your turn to make decisions.