Unlikely it was the person's direct manager who made the call to fire them. I would normally assume this person won't be up for a promotion for a long time. And they'd need to do everything by the book going forward.

On the other hand they've shown everyone they have backbone and that Atlassian ss petty and engages in illegal retaliation. So the company may be forced to be on its best behavior with this person in the future.

In this particular case I'd argue that the workplace is indeed going to be very hostile, and appropriate reparations here would not be to rehire, but a fat compensation package for unfair dismissal.

Many worker relations ombuds around the world has procedures for exactly this scenario.

Hell, I reckon the majority of 'illegal' firings does not result in rehiring the injured party.

Even if that's the case, this ensures that she has a stable paycheck while she searches for another job.

Yeah I can't imagine that playing out particularly well. Maybe at a company as large as Atlassian it is feasible enough to stay isolated. But I'd think the relationship is tainted from both sides at this point and doesn't favor either party.

I don't know about other companies, but I don't really interact with my manager outside of 1 on 1s like once a quarter. Also, it's never his choice to fire someone, it's always from above. I'm sure if he was forced to lay someone off he'd be just as happy as they are to have them back.