Welcome to your interview.
The question is on your right: Consistency Across Service Pipelines. 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 pipelines that ingest and reconcile data produced by multiple microservices. Each service publishes updates independently, and downstream consumers need a consistent view even when messages arrive late, out of order, or more than once.
How do you ensure data consistency across multiple microservices?