Nexient Javascript Developer interview questions

The HR department lacks proper followup and professionalism. I applied online which included submitting a resume, and received a phone call the same day to schedule an onsite interview at the Ann Arbor location, approximately an hour from where I live. The HR representative I spoke with told me he had been working there for approximately 6 years. When I arrived for the interview, I was taken into a conference room with the HR representative who immediately asked me what my salary requirements for the position were, as well as what I was making at my current position. I proceeded to let him know I didn't feel it was appropriate to discuss this before an interview, and although he pressed me to get an answer, I politely declined. He then requested a copy of my resume, and it was clear he wasn't prepared and was going to make photocopies. After our conversation wrapped up, I waited for 30 minutes alone in the interview room because the HR representative had incorrectly scheduled the meeting as a phone screening, so they weren't prepared for my onsite interview. I received a phone call the day after the interview from the HR representative letting me know Nexient would be making me an offer as a Junior Developer in the low 50s. This was quite surprising to me, as I have received offers for mid-level positions with starting salaries 50% higher. I thanked him for the call and politely wrapped up, and his last word/response was "whatever", and he hung up the phone. This was the most unprofessional interview process I've experienced. The HR component was substandard and lacking professionalism.