Altair Engineering Software Engineer interview questions

After resume selected there was 2 technical rounds after that hr round. Interview was easy I'm fully satisfied overall interview process but i had one more opportunity so declined ......................

The interview process is very slow and long. Initial call with recruiter afterward 3 weeks later first interview set up with the hiring manager and after another 3 weeks technical interview set up with the team. after that they call me and land me a verbal offer over the phone and never heard back from them till today. Recuirter are not giving back feedback nor answering your emails. worst interview process ever.