Just wrapped up their hiring process for a senior platform eng role, so here's what I saw.
Phone screen was a recruiter call (20 min, standard) followed by a technical screen. The tech screen was one LC-medium on graphs, not too wild. Then the virtual onsite was 5 sessions over two days.
What was in the onsite: 2 coding rounds (one felt like a real-world distributed systems problem more than a pure LC puzzle, which I appreciated) 1 system design: design a real-time leaderboard for millions of concurrent players. they pushed hard on consistency vs. availability tradeoffs 1 behavioral 1 cross-functional/culture round with a non-engineer
The design round is where they really probe. I got asked follow-up questions for 40 minutes. They want to see that you can hold the whole system in your head and defend tradeoffs without getting defensive when they push back.
Behavioral was fairly standard, ownership and failure stories. The cross-functional one surprised me a bit because it went deep on how I think about child safety and platform trust, not just generic collaboration questions. Given who their users are, that makes total sense in hindsight.
Did not get an offer, but the process itself was well-run. Interviewers were prepared and didn't waste time.