Your question is Cache Layer for High-Read Latency. 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 cache layer to reduce latency for a high-read service.
Explain how you would choose the cache location and eviction policy, handle cache misses and invalidation, and preserve correctness during failures. Discuss the measurements and operational safeguards you would use to validate latency and reliability improvements.