Your question is DB Migration Platform for NoSQL. 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 DB migration platform for a company like Ticketmaster transitioning to a NoSQL datastore.
Asked in the HLD round stage. The interview was one hour with an interviewer from the Sydney office. Explain how the platform discovers source schemas and workloads, proposes migration plans, executes backfills and dual writes, validates correctness, and handles rollback. If using ML, distinguish offline analysis from online migration controls and explain how you would evaluate and monitor it.