The company invited me to their offices for a number of interviews. The usual process is a general technical interview first, then an in-office test (a few hours), then HR and then upper management. The first stage involves two managers talking to you, and the second has two managers as well, but they mostly check the progress. It's a fairly standard process for such a company, and the questions were relevant and to the point. Aside from making me wait 40 minutes at the reception the first time, I have no complaints there. However, what happened after the second interview was weird and unprofessional, and unbecoming of such a company. Basically I came to the position with vast experience in the field, but not the specific technologies they were using (I had a bit of experience with their stack though, not nil). The interviewers repeatedly told me that this wasn't an issue, even when I offered to do the tests with their tech—and I would be tested in whatever technologies I felt comfortable with. They even installed a local server and IDE for me. Thus I was able to breeze through the technical questions and tests. When I completed the final technical test, they said they were satisfied, and actually went to fetch the HR person for the last (non-technical) stages of the process. However, the HR was unavailable, so they said they would call me back. A few days later I got a call from HR saying I was unsuitable. Asking why, the answer was that they were looking for someone more familiar with their specific tech stack. Any other reason would have been understandable, but this is just trolling, in light of the above. Felt like my time had been thoroughly wasted after that call.

HR interview, first on the phone then in person. The HR person didn't read my CV before the interview, wasn't interested when I described the challenges in my previous projects, don't actually know what he wanted to hear. Couldn't explain what is the team he's hiring for doing different compared to existing teams. Didn't answer any of my questions about the company except repeating how great it is. Specifically was hostile when I asked how many engineers were hired in the last 6-12 months.