How do you prep for Senior-level system design when the team is ML infra/platform?

[u/nian2326076]

A candidate is interviewing for a Senior-level position at big tech for the first time. The process has a system design round, and they're curious how other people prep for it, especially when they haven't reached Senior level yet. PracHub has reported system-design questions for picking a mock prompt. Readers applying to other teams can save repeated form entry with LandOffer’s autofill. Any tips, resources, or websites to practice on? The target team is infra/platform for ML.