Recruiter contacted me directly on Linkedin about a backfill position. Finished recruiter screen, then technical interview with question below. Then interviewed with hiring manager who explained that position would involve traditional ML. I wasn't interested in the role after that, so declined invitation for final round (5.5 hours of virtual onsite with presentation, system design, another technical interview on ML fundamentals, behavioral, etc.).

After the recruiter call, there's a staff interview. Then a technical test conducted by a staff member. Then a marathon interview day with multiple meetings and presentation at the end.