A hacker is a kind of engineer. Large companies require all sorts; expecting all of your engineers to be “hackers” is the kind of prima-donna-mentality-encouraging behavior that I would expect Meta to have grown out of by now.
Sometimes I need a wizard with multi-domain knowledge to whip up a POC system, but most of the time I need someone to ensure all of the pieces work, have specs that meet reqs, and won't cause an outage when we deploy them.
I've always found the term "hacker" pretty eye-rolly.