First interview (phone screen) was scheduled relatively easily.

However, they use a non-standard tool for VoIP interviews (not Skype) which doesn't have a functional Linux client. I notified HR right away, but she made no effort to make accommodation.

During the interview, I explained the issue to the interviewer, and we ended up using Skype anyway.

Passed to the on-site.

First interview was fairly easy. Second interviewer asked me a question to which he admitted if I didn't know the exact technique he wanted (which I didn't, having never learned it in school and it being an academic algorithms technique with little practical application), then I wouldn't get it. So, of course, I didn't get the question.

A month later, I am still waiting for reimbursement for costs I expensed to them over my trip to NYC for the in-person, which they said they would pay.

Topological Sort