Your question is Evaluate an End-to-End Recommender. 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).
You are working on a recommendation system for a digital product with personalized content feeds. The team wants a clear framework to judge model quality before launch and business impact after launch, across the full pipeline from candidate generation to final ranking.
How would you evaluate a recommendation system end to end?