Welcome to your interview.
The question is on your right: Consistency Across Data Sources. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
You're working on a pipeline that combines data from multiple upstream systems, and the same business entities can appear in more than one source. You want a clean, trustworthy dataset before downstream analytics or applications depend on it.
How do you ensure data consistency across multiple data sources?