Your question is Cache Scheme for Web App. 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).
Describe how you would design a caching scheme for a web application.
Discuss cache placement, key design, TTL and invalidation policies, eviction, consistency, failure handling, and observability. Explain how your design would adapt to read-heavy and rapidly changing data without creating correctness or availability problems.
