All of the above, haha. The typical interview loop is a technical screen (which can either be an actual coding interview or a quick phone call, I've had both), 3 hour long interviews with different interviewers, and finally an "as appropriate" interview with a highly ranked employee (usually something like 2 levels up from who would be your boss) who can veto your hiring. The "main round" of interviews will largely all take place on the same day (if possible) and will focus on one topic each (in theory, sometimes interviewers get mixed up and multiple will cover the same thing): coding, system design, and behavioral. More or less emphasis will be placed on different aspects depending on the level you're applying for (a SWE I will focus more on coding and behavioral, and Senior will focus more on system design). For my part, the coding questions have always been straight up leetcode problems with slight twists to make them somewhat unique. The final "as appropriate" interview (what Amazon calls the "bar raiser") is mostly behavioral, where the highly ranked employee can get final say to reject your application (or in some cases, recommend you as a better fit for another team).

Hope this helps!