After applying, if you are selected for the 1st round, you will have 45 minutes to do an online test (questions about yourself and your experience) — 2nd round interview with the CEO.
For the 1st round, you will receive an email with subject"PSiDEO: your application, additional information request" and all the information about what is required, how it will be this step and information about all the next steps. Clear and concise information.
About previous comments in Glassdoor, I must say that wasn't like that at all with me. I had 2hs interview and I was told from the begining (before scheduling it) about this possible duration. I was asked during the interview if any issue about the timing. PSiDEO showed to me with different details that my time was as important as theirs.
The interview is interesting, you will have there all the detailed information about the position and company, what I think is really great to ensure that both sides are aligned. You can ask all your questions. I had the interview with M. Patrick Stuto (CEO) and he is super kind and easy to talk, he really made the interview super enjoyable.