Your question is Billing Module for AWS Storage. 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 billing module: users on AWS get cloud storage by subscription, extra storage auto-allocated when exceeded, usage logs written every 15 minutes to a DB, and the billing module parses logs per user id and sends data to AWS billing.
Asked in the Technical 2 stage.
Explain the deterministic billing path and identify where ML could safely assist, such as detecting anomalous usage or forecasting capacity, without changing billable usage without validation.