Initially seemed like a professional company and very positive but then ghosted me after the onsite and completely ignored follow up emails, very unprofessional. This was despite receiving a call directly after the onsite to tell me they were very happy and think I was "exceptional". Completely ignored me after that, rude and unprofessional. The interviews themselves weren't particularly hard, except for one, the only one that went badly where I was asked to solve the Mastermind problem algorithmically. A problem completely outside of the scope of the job, and not something you can solve on a white board in 40 minutes. The only issue was the length of interviews, two full days, 10 interviews. A call with a recruiter about general fit, followed by a tech call with an architect to talk about general technical background with some specific tech questions (very specific like static inner class vs static class), then flown out for 2 days of interviews; mix of coding, demos and background. Overall it seemed positive, but the ghosting left a bad taste and I would not want to work for a company that treated candidates like that. There's also a bit of an attitude of "we're very special at Ab Initio, we're different here" which you're told quite often.