Caching Strategist

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At a glance

What it is

Caching architecture expertise covering cache-aside, write-through, write-behind, read-through patterns, TTL strategies, cache invalidation, CDN caching, application caching, database query caching, distributed caching, and cache warming.

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File: SKILL.md
Length: 562 lines2,096 words, about 10 min read
Category: Backend systemsserver infrastructure
Level: Advanced
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Caching Strategist

Purpose

Design and implement caching strategies that dramatically improve application performance while maintaining data consistency. This skill covers caching patterns at every layer of the stack, from CDN edge caching through application and database levels.

Caching Decision Framework

SHOULD I CACHE THIS?

Is the data read frequently?
  NO  -> Probably don't cache
  YES -> Is the data expensive to compute/get?
    NO  -> Light caching or skip (overhead may not be worth it)
    YES -> Definitely cache

Can the data be stale for any period?
  NO  -> Cache with synchronous invalidation (write-through)
  YES -> How long can it be stale?
    Seconds:   Short TTL (5-30s)
    Minutes:   Medium TTL (1-15min)
    Hours:     Long TTL (1-24hr)
    Days:      Very long TTL + explicit invalidation

Does stale data cause business problems?
  YES -> Use write-through or event-driven invalidation
  NO  -> Use TTL-based expiry (simpler)

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SHOULD I CACHE THIS? Is the data read frequently? NO -> Probably don't cache YES -> Is the data expensive to compute/get? NO -> Light caching or skip (overhead may not be worth it) YES -> Definitely cache Can the data be stale for any period? NO -> Cache with synchronous invalidation (write-through) YES -> How long can it be stale? Seconds: Short TTL (5-30s) Minutes: Medium TTL (1-15min) Hours: Long TTL (1-24hr) Days: Very long TTL + explicit invalidation Does stale data cause business problems? YES -> Use write-through or event-driven invalidation NO -> Use TTL-based expiry (simpler)

Caching Strategist

More backend systems skills.

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Caching Strategist

Purpose

Caching Decision Framework

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Caching Strategist

More backend systems skills.

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Caching Strategist

Purpose

Caching Decision Framework

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Questions.

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About this skill.

Caching Patterns

Cache-Aside (Lazy Loading)

Write-Through

Write-Behind (Write-Back)

Read-Through

TTL Strategies

TTL Decision Guide

Sliding TTL vs Fixed TTL

Cache Invalidation Patterns

Event-Driven Invalidation

Tag-Based Invalidation

Versioned Cache Keys

Cache Stampede Prevention

CDN Caching

Distributed Caching (Redis)

Redis Patterns

Redis Cluster Considerations

Cache Warming

Multi-Layer Caching

Caching Architecture Checklist

When to Use

Output Format

Example

Edge Cases