The interview process started around November with the recruiter. Late January I got scheduled six more interviews with two teams -- the hiring manager of each and team members. Very easy going, conversation-like interviews rather than intimidating questionnaires. A lot of it was about technical skills since the role was technical indeed. Weeks later I received an offer letter that was then withdrawn after I said I was on OPT. The recruiter basically ghosted me and stopped replying my emails.