They have very high standards, and it is pretty hard to meet them unless you have startup experience. They seem to focus a lot on scalability. The interviewers were bad communicators and did not explain the requirements clearly. Despite asking follow-up questions to clarify the requirements, they still gave vague answers but expected the solution to mirror their internal one.

Stage 1:
15 Min call (Nothing fancy, they just vet your past experience)

Stage 2: Technical Round
They ask you to build something (usually a function), and the second half of the interview is about writing a function to test whether your implementation works for "millions of queries."

Stage 3: System Design
Depending on which team you will be placed in, a panel will ask you to design an existing system. They then barrage you with questions about scalability.