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The job you’re applying for says, “Redis experience required.” Are you ready for the questions a hiring manager is likely to ask? Here’s how to prepare for the job interview... as inspired by Lord of the Rings.

Nominally the article is written for someone getting answers ready for Redis-specific questions, but I think they'd apply for any database-related job. Especially if you have experience with one tool and the job asks for experience with another.

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As noted, Redis questions often stand in for broader database and systems knowledge. Interviewers are usually probing for practical trade-offs, not rote command recall. The checklist below highlights the concrete areas to prepare and how to present answers that show real competence.

  • Data modeling: when to use Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLog and modules; show why a structure fits a problem.
  • Durability: differences and trade-offs between RDB snapshots and AOF (durability, recovery time, write amplification).
  • Replication and HA: replicas, Sentinel vs Cluster, failover behavior and what eventual consistency means in practice.
  • Scaling: partitioning/sharding limits, cross-shard operations, and strategies for hot keys.
  • Memory and eviction: maxmemory, eviction policies, avoiding large keys, and using SCAN instead of KEYS in production.
  • Performance patterns: pipelining, batching, Lua scripting for atomic multi-step work, and pitfalls of blocking commands.
  • Monitoring and troubleshooting: using INFO, SLOWLOG, memory stats, and recognizing slow commands or fragmentation.

Answer structure that scores: define the concept briefly, describe a concrete scenario you handled or could build, explain steps and trade-offs, and cite numbers (latency, throughput, memory) when possible. For candidates without production Redis experience, build a tiny proof-of-concept (single-node or a small Docker cluster), run redis-benchmark, and report measured results. A short, honest demo and clear trade-offs beat theatrical metaphors every time — a point even hinted at with a wry aside.

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