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system-design-patterns

Deep reference for scaling systems — load balancers, caches, queues, replicas, sharding, CDNs, CAP and consistency models, idempotency, and back-of-envelope capacity estimation. Use when designing a scalable backend, sizing infrastructure, or answering a system-design interview/RFC.

$npx vanara install system-design-patterns

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Overview

Scaling is mostly about applying a few well-understood building blocks at the right moment — and not before. Premature distribution buys you operational pain without the load to justify it. This skill is the deep reference for the blocks, the failure modes, and the math you use to decide. Heavy detail lives in references/; copy-paste material in examples/; a runnable capacity estimator in scripts/

What it covers

Details

Tier
Pro — $10/mo
Version
2.0.0
Depth
4 references · 2 examples · 1 runnable scripts
Verification
1/1 runnable checks passing ✓
Runs on
Your own Claude Code — no API keys
api-paginationImplement correct, fast API pagination — cursor vs offset trade-offs, opaque cursor encoding, stable sort keys, page-size limits, total-count costs, and consumer-side iteration that survives inserts, deletes, and retries. With runnable cursor checks.app-store-optimizationHow to optimize an app-store listing (ASO) for discovery and conversion — title, subtitle, keywords, screenshots, icon, ratings, and the metadata that drives installs. A deep reference with worked Apple and Google listings and a runnable listing linter.audit-loggingDesign tamper-evident audit logs that satisfy security and compliance — what to record (who/what/when/where/outcome), what to never log (secrets/PII), structured immutable events, hash-chaining for tamper-evidence, retention, and access control. A deep reference with runnable validation.background-jobsDesign background job systems that don't lose or double work — enqueue-after-commit, retry policies with jitter, idempotent handlers, visibility timeouts, priority lanes, scheduled and recurring jobs, worker scaling, and observability for async work. With a runnable retry-policy check.backup-and-recoveryDesign and operate a tested backup and disaster-recovery strategy — the 3-2-1 rule, RPO/RTO targets, full vs incremental vs differential, point-in-time recovery, encryption, offsite/immutable copies, retention, and the restore drills that prove a backup actually works.c4-diagrammingDocument software architecture with the C4 model (Context, Container, Component, Code) as text-based diagrams in version control. Covers the four abstraction levels, notation discipline, when to draw each level (and when to stop), supplementary diagrams, and Mermaid/Structurizr tooling.
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