The whole process took forever like over 3 months from submitting the application to the final interview... There were 3 rounds in total, all quite a casual conversation. No written tests.

It was fairly straightforward. I found the exchanges with the recruiter to be very pleasant and informative. The 1:1 with the hiring manager was a great conversation. However, the company HR manager was fairly reserved and not necessarily a great ambassador for the company. The interview felt less like an interrogation based on qualifications than maybe what someone might feel interviewing for a private club. I would say the culture is extremely conservative.