Called with hiring manager first to talk about the position, my background and a few technical questions, then virtual onsite and did a presentation, after the presentation, had multiple one on one

I was interviewed for three round. First with hm, second with engineer and third with the staff engineer from orther groups. It takes about over. 3 months. The final round contains a presentation for 1 h and talk with 5 orther staff/principal/manager level engineer and answer technical questions.