Good question! I already answered part of it a couple of questions above, but let me be more thorough here:
Communication: I always try to be as clear as possible. If things are unclear, I'll sort them out, and I'll run my approach by you when it needs validation. I always try my best to update the people I report to before they feel the need to ask. If something changes that impacts the deadline, you'd likely want to be informed as soon as possible, not the evening before D-day.
Quality and pragmatism: I write tests wherever I can. I always try to follow the established work policies, but I do question them when something feels inefficient. On a tight deadline, assuming we can't negotiate the scope of the delivery, what I find sensible is to do what works but always create a ticket for a second pass later: refactoring and more tests.
Humanity: I don't believe a company is a family (shocking, I know!). But I do believe, to some extent, that we're teammates. Some of us love our jobs, some of us are just paying the bills. Either way, it helps if kindness is our default state. A little bit of camaraderie doesn't hurt, though everyone has their boundaries. I always try to separate the person from the action, as much as is humanly possible. Though, on rare occasions, it's not possible.
Disagree and commit: I can explain it but I think others already did the work for me. That said, I value a company that lets its employees speak up on a given issue. But once leadership has settled on a direction, I put my hat on and do the work accordingly, even if I don't agree. I'm never the one who'll say "I told you so" when things go wrong because my idea did not get picked up. If it turns out they were wrong, we fix it together. But if something really is crucial and non-negotiable for me, a proper and peaceful departure is better than bitterness.
That's it, I guess. Yes, these are all pretty much standard in the industry, even, dare I say, boring. But boring is good sometimes. It means it has worked for many people for a long time. I came to write those points not by googling workplace best practices but really by getting bitten several times in the past. At some point, you learn.