Your question is Modernizing a Legacy Data 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).
Explain a time you had to modernize a legacy data system; what were the primary challenges?
Describe the legacy architecture, the target ETL or ELT design, and how you migrated without disrupting downstream consumers. Cover data quality, schema compatibility, orchestration, testing, observability, rollback, and how you measured modernization success.