Having built a prototype of a system like Ursa myself, this isn't something that you need to use at all, especially because it seems like this is only available in S3 Express One Zone.
I've seen a bunch of people recommending alternatives that are also Python based, makes me wonder if there's similar things for other languages like Go, Rust, etc
Square/Block (used to?) ask only 1 system design question and the recruiter would let you know ahead of time so you could prepare for it. Probably because it allows for deeper questioning and answering of relevant technical skills.