Your question is Deep Dive Into Product Architecture. 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).
Tell me about the architecture of the product you worked on, and explain why and how the technologies were coupled together.
Describe the system end to end, including data flow, model development, serving, storage, APIs, and operational dependencies. State the scale, latency, availability, and freshness requirements from your product, then explain the tradeoffs behind each major technology choice. Cover offline and online paths, evaluation, deployment, monitoring, and at least two failure modes. Be prepared to discuss how you handled feature drift, training-serving skew, backward compatibility, and graceful degradation.