Caching Strategies for a SaaS

Short summary

A practical guide to caching for SaaS applications, arguing against defensive caching and instead targeting specific hot queries where read frequency far exceeds write frequency. It recommends Redis as a shared cache over in-process maps for multi-instance setups, and favors the cache-aside pattern for most SaaS workloads. CDN and browser caching are covered for public assets but dismissed for authenticated, tenant-scoped API responses.

• •Cache only where a specific query is genuinely hot — not as a blanket policy
• •Use Redis over in-process caches for shared invalidation across multiple API instances
• •Cache-aside covers most SaaS read paths; write-through is overkill for rarely-written data

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