Apple Hardware Engineer interview questions

Applied online and HR reached me out. First interview was with HR to see where I stand. Then an engineer from the department interviewed asking more technical questions related to resume. It was followed by a more technical interview where I was asked to write down circuit questions and solve/explain. I was then given a 24-hour assignment which included a design/business questions and 4 pretty difficult circuit questions. It was followed by 2 more phone interviews by s different engineer and engineering manager.