I think it checks the referral page you came from when clicking it and shows the {"is_fb_employee":"maybe soon? https://www.facebook.com/careers/department.php?

I think it checks the referral page you came from when clicking it and shows the {"is_fb_employee":"maybe soon? https://www.facebook.com/careers/department.php?dept=engineering https://www.facebook.com/careers/department.php?dept=enginee...} when coming from HN. If I open a new window and copy/pasta the URL, it'll say false :)