technical interview - pseudo code (hard) technical interview - c/c++ code on laptop (medium) technical interview - operating systems (hard) HR - normal process is as usual long, harder than avg but solvable, people are nice

I was contacted by a recruiter from DriveNets. First step was a zoom interview where I connected with 2 senior members of technical staff, they did a resume walkthrough and asked me a leetcode style medium question which i solved in my choice of language. I did not have experience writing code in their preferred choice of language and the engineers knew about it very well and were okay with it. The recruiter strongly emphasized that I had done well in the interview and they wanted me to meet for an in person interview. I literally travelled across the country at my own expense for that interview. The Hiring Manager was the most stale personality I'd ever met. Not at all welcoming. No intention of getting to know me or my background and jumped straight into the technical questions. Once again I was asked a medium leetcode style question followed by some theoretical questions all of which I answered correctly. Once again I was asked if I had experience writing code in their preferred language which was odd because they knew it before and decided to give me a shot anyway. A week later I heard back from the recruiter saying that weren't willing to move forward as they need someone who's got hands on experience with their stack as the did not want to invest time in any mentorship. Absolutely unprofessional and I lost plenty of money doing a round trip and covering my own expenses and wasn't even treated with a basic level of courtesy. Stay away as they would mostly waste your time, energy and resources.