Overall, the interview was a interview was friendly, but challenging. The most common question was to describe a time when an idea or solution of mine, in which I was invested, was turned down in favor of another idea/solution.
There were four, thirty minute interviews in total. The first interview was with someone from HR, who gave a tour of the office, went over the job description, benefits, etc., and administered a short IQ test of simple math problems. The second interview was with someone from sales who discussed the culture at 4moms and the "Words [4moms] Lives By." The third interview was with two project leads who asked some engineering questions and discussed problem-solving skills. The last interview was with two engineering managers who dug deep into my engineering portfolio and asked how I arrived at my solutions.
I felt confident leaving the interview, having connected with everyone on the need to be humble and work hard. A week later, one of the engineering managers followed up with a homework assignment to design a few novel mechanisms (within the context of the problem) and have me compare my designs for cost and manufacturability. Given the other engineers I knew who were interviewing, I wasn't confident about my homework answers, but I think I had a good fit within 4moms - I accepted a job offer the next week.