4 technical rounds , 1st round director over all experience about projects and general verification questions, 2nd round manager deep dive into technical wnt around 1hour 45 minutes , 3rd round 2 hours with 2 different sites, principal engineer , senior engineer, 4th round , director and senior engineer,3 hours with 3 interviewers each went one hour all technical questions , process last 6 to 7 weeks , all virtual