The first interview was a technical interview with a recruiting officer. It is almost exclusively technical and decently challenging. They asked questions about electronics and C programming. Some of the topics they included were filters ADCs, voltage regulators, and power.

Three interviews: First with HR, second with an engineer, final with engineering manager. First was a mix of behavioral and technical, last two were all technical. Mix between resume questions and unrelated technical questions. Technical question difficulty was medium, and interviewers were willing to adjust the questions a bit when I was unable to answer them.