Prime Therapeutics Sr. Network Engineer interview questions

HR screening followed by Panel Interview and the three 1:1 interviews. HR was pretty standoffish from the beginning. I really enjoyed the team and every interview aftet the initial HR conversation. After almost a 3 month long interview process I was asked to accept an offer verbally before receiving the actual offer letter. Offer was non negatioable. I dont believe HR actually relayed my counter offer to anyone. HR was overrall very unprofessional