I concur with the previous posters. You can ignore all the previous Glassdoor posts about a non-responsive team; they have entirely streamlined the process, and it was incredibly efficient.

I am currently in the midst of interviewing at other places, and I agree with what the poster above me said: This is definitely the best technical interview that I've been through, although it does have a long process (many more rounds than I am used to). However, the entire process is very well conducted and extremely engaging.

You will get a phone screen, then an EM screen, then a technical screen, before you move to the on-sites. The on-sites are a marathon, so be prepared for them. You will do 5 rounds during the on-sites, and this was easily the most interesting and engaging interview I've attended.

Signed an NDA. It was a very fun and interesting process. One of the few interviews where I walked away learning more than what I brought to the table.