OA: build a web app. whole process broken into 4 sections, you need to make unit tests for current section pass to proceed to next. Final rounds: behavior, frontend coding, system design. Managed to complete all coding related tasks, and answered all system design questions. Behavior round is a bit strange, not getting much follow up questions after I've made initial response.

Phone screening first, doing a small widget like their website. Onsite interviews, 5 rounds, including debugging, coding, design, behavior. All interviewers are remote. Seems they only need the expected answer, your approach doesn't matter. If you cannot get the answer they want, you fail.