It's either a a Career Limiting Event, or a Career Learning event.

In the case of a Learning event, you keep your job, and take the time to make the environment more resilient to this kind of issue.

In the case of a Limiting event, you lose your job, and get hired somewhere else for significantly better pay, and make the new environment more resilient to this kind of issue.

Hopefully the Wikimedia foundation is the former.

In the average real world, the staff engineer learns nothing, regardless of whether they get to lose or keep their job. Some time down the line, they make other careless mistakes. Eventually they retire, having learned nothing.

This is more common than you'd think.