Your question is Debug Complex Systems. 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).
How do you approach debugging complex systems?
Discuss your approach in the context of ETL or ELT pipelines. Cover how you isolate failures across ingestion, transformation, orchestration, storage, and serving layers; validate data correctness; identify performance bottlenecks; and prevent recurrence through monitoring, testing, and runbooks.