Was contacted through LinkedIn by a rep from the company. I initially told them that I my forte wasn't really realtime/control/robotics type software, so I doubted that they'd have much use for someone with my background. They got back with me and said that they were actually trying to fill a new position that had a lot to do with embedded Linux (soft realtime at best), so I became more interested. After an initial phone screen with the hiring manager, I was invited for an on-site interview.
The on-site interview had two sessions, each meeting with multiple people simultaneously. The first one was with the hiring manager, and another engineer who appeared to have a hardware oriented background. It wasn't really much of a technical interview, but more just a series of questions about things I'd worked on in the past. Most of the things that they seemed interested in (how to handle firmware updates over the network, how to package built images, etc) seemed to align pretty well with things I'd done. The conversation seemed to be pretty positive overall. Toward the end, I asked if there were any weak spots in my experience that they'd like to go into a little more detail about, to which their reply was "No, this all looks pretty good".
The next session was with Maxim (one of the founders) and two other R&D people. At this point the interview got really informal. Maxim seemed to spend most of the time looking at my LinkedIn profile while asking questions like "how did we get in contact with you?" and trying to figure out who our common colleagues were. The conversation with the others was more like a chat session, since they didn't really seem to have any questions that were of substance at all.
After the "formal" interview was over, the hiring manager took me on a short tour of their lab. I left the interview thinking that it must have been positive enough that it would result in some sort of further conversation (otherwise, why would they have wasted time showing me the lab and potentially leaking proprietary details about the product that was in development?).
After about a week, I still hadn't heard anything, so I pinged the hiring manager via email. A couple of weeks after that, he got back with me and basically just said that they weren't interested in moving any further. It was a little bit disappointing, since the interview seemed to have gone positively and my experience seemed very well aligned with what they were looking for. I replied, asking if there was anything in particular that I might have been able to have done better, or anything they'd like to have seen more experience with, to which I received no response.