J.P. Morgan Machine Learning Engineer interview questions

Interview process is ok, and fluent, first round is presentation. then each person would ask you about machine learning algorithm, some coding algorithm, very straightforward. and people are very nice and friendly. I like talk with them, HOWEVER, I guess their HR and entire system are biggest drawback. first, they schedule the wrong on-site time. Let's ignore these, it is almost 5 month, and they didn't even reimburse my onsite expenses, plus the hotel is paid by myself. I have sent multiple emails to their reimbursement team, nobody really response me. When the HR talk with me about offer, I feel like I am really doesn't matter to them. very bad system. technique team are good.