Novoptim interview questions

Despite of multiple rounds of interviews (the last one was onsite), I have been ghosted by Novoptim, even after a sent follow up 3rd rounds interview: 1st 45min screening, 2nd with the Business development director 1 hr, then onsite interview including short case study, 1hr with the Business development director again, interview with 2 team members, then 1 with CEO, and an office tour

6 rounds of interview. But at the 3rd round they said there will be 4 rounds. 2 rounds of 1-1 with COO and 3rd round included a presentation. Challenging interview with tough Q&A session. Process was fast overall but after the 4th round, it took 2 months for them to reply my email with a rejection.