So I went through the initial phone screening. After a week after that they called me for the second round interview. During the second interview I went over in detail what was on my resume and how I can contribute that to the company and I also asked many questions about the position I applied for. And then they brought me in for another on-site interview (third). The third interview covered the typical behavioral questions like weaknesses/strengths and teamwork experience. The hiring manager told me that if they decided to hire me, they would contact me by the end of the following week.
However, I did not hear from them the following week but got another email from them saying they're going to set up an interview with the company's Co-Founder (which was unexpected). I thought the whole interview process was three rounds, and that was exactly what the hiring manager told me during the on-site interview.
I'm at a loss right now as to what questions the co-founder is going to ask me because I have told them every bit of details of my experience to them during my third interview. Anyone with experience with third interviews please help me get a better idea of what to expect.