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Aporeon interview preparation

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Distributed Caching & Redis

Cache Scenarios

Slow endpoints, hot keys, eviction, stale permissions, Redis rate limits, caching patterns, and cache observability.

7 drillsPractice one at a timeOrdered pathConcept questionComparison question

Recommended start

Cache Decision

Explains how to decide if caching is the right fix for a slow API endpoint instead of query tuning or contract changes.

Medium~7 minStep 1 of 7

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1Cache DecisionRecommended startExplains how to decide if caching is the right fix for a slow API endpoint instead of query tuning or contract changes.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 2Hot KeyExplains hot-key behavior, traffic concentration, partition pressure, payload size, and mitigation options.Concept questionHard~9 min.NETASP.NET CoreRedisPractice 3EvictionExplains Redis memory pressure, eviction policies, key sizing, TTL discipline, and what happens when the cache is full.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 4Permission CacheExplains why cached authorization decisions are risky and how to bound or invalidate permission-related cache safely.Concept questionHard~9 min.NETASP.NET CoreRedisPractice 5Rate LimitsExplains Redis-backed rate-limit counters, atomic increments, windows, identity keys, and fallback behavior.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 6Caching PatternsCompares cache-aside, read-through, and write-through by read and write ownership, freshness, failure behavior, invalidation, fallback, stampede control, and operational complexity.Comparison questionMedium~7 min.NETASP.NET CoreRedisPractice 7Cache MetricsExplains cache observability across hit rate, latency, source load, memory, evictions, stale data, and fallback behavior.Concept questionEasy~5 min.NETASP.NET CoreAzurePractice

Practice order

7 drillsOne at a time

1Cache DecisionUp next / Medium / ~7 min
2Hot KeyHard / ~9 min
3EvictionMedium / ~7 min
4Permission CacheHard / ~9 min
5Rate LimitsMedium / ~7 min
6Caching PatternsMedium / ~7 min
7Cache MetricsEasy / ~5 min