W.E. Matter interview questions

I was reached out by HR via linkedIn, on asking about their budget, they said that they have budget. Now first round was telephonic interview round taken by their engineer, asking basic question about http, asking about experience, nothing major. Then I had interview rounds with their CTO, CEO & what not, simply by talking to them you can get an idea that they are not knowledgeable in technology & for me they started asking if I can do data science, ML which is irrelevant for backend engineer. All these rounds were taking place late in night. During these interviews I asked HR about their budget & proper JD, but no satisfactory answer All of this process took around 3 weeks, & they would offer you 5% meagre hike on current CTC.