There were 3 interviews in total. The first one is a screening call with the recruiter. They briefly asked about my interest in the position, what I know about it, and what questions to expect in the interview with the engineer. The second one was with the project lead. It was an hr long. He asked me to talk about myself then based on that he started digging into my past work experience and projects. Then asked a couple of technical questions about the area of firmware and what I know about it. it was very chill and surface level. The last one was 6 hrs long with 6 different engineers, the whole team. Each one took 45 mins. The questions were very technical and involved. They would put you in real scenarios and see how you solve problems and complicate the scenario as you answer. You should be ready for analyzing systems, identifying pain points and troubleshooting, writing some codes, and answering behavioral questions. Some of them were nice and would give feedback as you go, and some were very poker face I would not know if I was doing good or not.

Technical screening was directly and only coding. Didn't ask intro or anything. Try to explain theory concepts in between coding, they seem to like it. Basic C question, pointer arithmatic, bit manipuation etc,