I was interviewed by hiring manager. It was technical interview. There were questions on voice call processing, SIP, voip. There were also software programming questions. I thought I did well

The director of HR initially contacted me on LinkedIn and was interested in my experience. We had a quick phone interview, followed by a phone interview with the director of engineering and a coding test via the browser as he watched. The tool wasn't the greatest, it doesn't have intellisense which (unknowingly) I rely on heavy. After that I was brought in for a 2 hour technical interview which was probably normal for this industry (theoretical question, technical questions, design excercise). I was made an offer then brought in for an informal interview just to get to know me more.