Your question is Multisource Analytics System. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a system where data resides in 20-30 sources and needs to be made available for analytics use.
Asked in the Round 2 technical expertise and system design stage. Use a whiteboard and explain why you choose each technology, including ETL and AWS services.
Address how you would ingest heterogeneous sources, standardize and validate data, support batch and incremental updates, expose governed datasets for analytics, and monitor failures. Be prepared to explain the tradeoffs of every major design decision.