Note: I’m not a fan of Facebook. I didn’t get the role after the on-site.
Facebook for a data science role. Professional, relevant, fun. Edit: this was 2017, Menlo Park.
They evaluated multiple skills, from relevant behavioral type questions, to relevant technical questions.
Interviewers were engaged, smart, never arrogant, and I recall them asking questions about my resume that no one else asked about.
The feedback for not extending an offer was fair, and I think I even agreed with it actually.
And they were the only ones who gave me swag - and it was cool swag.
Looking back, it was one of the most professional experiences in my life. I will add, such experiences are not typical.