I was contacted by a recruiter to set up an interview. The tech phone screen featured a good question: checking algorithms and data structures, something about a matrix. The interviewer was absolutely great, and we had a good discussion at the end where he answered all my questions.

I was immediately contacted to set up an onsite interview. I received an email stating there would be a two-hour coding interview, but no other information was provided about the schedule, who I would be interviewing with, or what was expected. Going into it completely blind was not something I was comfortable with.

The lunch interview was scheduled with two people and felt quite awkward. I understand that a lunch interview is meant as a conversation and a culture fit test, but at times, the two interviewers would start talking to each other, and I wouldn't fit into the conversation at all. It was very strange.

I also received a couple of one-word answers. After two more interviews, I was asked to leave. That's fine, as I didn't perform well in the last round. The final round focused solely on infrastructure questions, even though I had made it clear that's not something we work on daily. So, be prepared to dissect your entire infrastructure pipeline when you go here.

They are very gentle and polite when they ask you to leave, making it similar to receiving a rejection by email, which is a considerate approach.

Recursive and iterative ways to flatten a list.

Given [1, [2,3], [[[4]]]], return [1,2,3,4].