The standard onsite gauntlet that FAANG companies are famous for! 2+ coding rounds, design/architecture, and a behavioral. I did better in some parts than others, but overall, i thought everything question was fair. There was no 'gotchas' or totally unexpected questions. I was most impressed in working with the Facebook recruiter. He was VERY organized, prompt, kept me in the loop, and overall very helpful in informing me what to expect and how to prep for the interview. Even after the on-site, during the hiring decision, he kept me informed of what was going on every step of the way. It felt like Facebook had a very well-defined recruiting process unlike some of the smaller startups.