The interview looked pretty average. It all started with a conversation with a recruiter. Then was a session with a couple of engineers where I was asked pretty easy questions about iOS basics. Then there was an assignment project that they gave three days to complete and asked to spend around three hours to implement. It was pretty straightforward, and I spent about three hours on it. After this, I got three different sessions with different engineers asking similar questions with a little more deep dive into them and one architectural part based on the assignment project. At the end, I had a conversation with an engineering manager. All sessions took 45 minutes each. It is beyond my understanding how one can assess architectural knowledge in 40 minutes (at least 5 minutes are left in each session for your questions). After all of this, I received a call from the recruiter saying that one of the sessions had "mixed" feedback. Whatever this means, they didn't get any expressive feedback and didn't give a chance to improve in the future. What worsens the situation is that I was told the feedback wasn't bad, it was just leveled not for Staff level, and they asked if I'm interested in a Senior role in another team. I said I am, as I was excited about Slack and confident in my experience and abilities, so I can grow within the company quickly. I then was asked to have a chat with another Engineering Manager. This conversation went smoothly as well. After this, I received another call from the recruiter saying that they've decided not to move further. No additional feedback was provided. They managed to reject me twice during one interview; that's a whole new level. The recruiter couldn't explain how it's possible and just repeated a few general phrases. I don't know if it's fair to a candidate, and it seems like they either didn't do their due diligence before asking me about another level or one of the interviewers simply didn't like me. My personal advice is to be more open and expressive in your feedback. I felt like it was a complete waste of time after such a rejection.

How Autolayout works.