Initial interview with hiring manager went well. This was followed up by a 4 hour interview onsite at corporate headquarters. The people who interviewed me were part of HR / Talent teams. With exception of one TA person, ZT's HR people were extremely unpleasant. They were nasty, unprofessional and the experience was so unpleasant that I considered walking out of mid interview, which I should have done. If you're an applicant here, consider this a warning No one spoke to each other, even in the hallways. Clear indication that morale is low. People seemed miserable.