I was reached by a in-house recruiter via Linkedin. The process was transparent and professional, took about 1.5 months to hear result. Email communication was the main channel. Positive feedbacks but did not not offered job

There are multiple rounds of interviews. Interviewed by the people you will potentially parter with. The level of people who interview you will be higher and higher. First they will ask you to describe your role in your past job, then talk about your experience related with the job you are interviewing. With different interviewers, talk about yourself a bit and how you work with your parters in the similar roles before.