Technical interview questions and drills

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Showing the Distributed Caching & Redis curriculum. Technology tags describe each drill's actual implementation context; shared drills can belong to more than one track.

Comparison questionMedium~7 min

Cache API responses versus domain objects

Compares caching response-shaped read models with caching domain entities or raw database objects.

In Distributed Caching & Redis

.NETASP.NET CoreRedisStackExchange.Redis

Drills

Cache API responses versus domain objects

Choose a TTL and expiration strategy for cached data

Compare cache-aside, read-through, and write-through caching

Compare in-memory cache and distributed cache

Compare Redis pub/sub and durable queues for cache invalidation

Decide whether a slow endpoint should be cached

Design cache keys with tenant and permission scope

Diagnose a hot key causing uneven Redis load

Explain stale data and eventual consistency in caching

Fix a stale permission cache security bug

Handle Redis memory pressure and eviction policy

Handle Redis outage with fallback and degraded mode

Invalidate cached data safely after writes

Measure cache health beyond hit rate

Prevent a cache stampede on hot keys

Reuse StackExchange.Redis connections and set sane timeouts

Serialize and version cached Redis values safely

Store session state safely in scaled-out ASP.NET Core

Use cache-aside for a read-heavy API endpoint

Use Redis counters for API rate limiting

Use Redis locks only with clear lease boundaries