Pall Principal Engineer interview questions

10 min with recruiter by phone ,1hr with hiring manager, panel interview with 10 members and individual interview with same 10 members. Stressful and spent a lot of time to prepare for all this at the end the recruiter didn't take 1 min of his time to inform me about the "regret " for no selection, the hiring manager informed me since I had his email. My advise do not engage time with unprofessional HR.