Got in a friendly chat with HR manager and department manager. It was honest and slightly deep conversation about work life and personal requirements. As I go on about my past, they interrupt and ask specific question about the point, which was better than general questions without any focus on work or past experiences. I can call it "no BS interview".

1- Interview with Head of Product 2- Case Study Process 3- Interview with CPO The whole process took more than 2 months. It was stated that all interviews and case studies were positive. However, it was said that this position was given up at the bidding stage.