Translate the business requirement into a technical objective.
Choose a loss function that aligns with the business goal (e.g., Log Loss for CTR). Offline Metrics: AUC, Precision-Recall, RMSE. Online Metrics: A/B testing, conversion rate, revenue. 6. Serving and Scalability How do you deploy this at scale?
Are we maximizing click-through rate (CTR) or user retention? Scale: How many queries per second (QPS)? How many users?