A reading room for system design

How the hardest systems are actually built.

A curated archive of engineering writing from Netflix, Meta, AWS, Cloudflare, Stripe, and others — distilled into concepts, patterns, and systems you can actually cite.

2,225Articles read

766Distilled

282Concepts

76Patterns

1,957Systems

41Companies

Start here

• Concept

  Control Plane / Data Plane Separation

  The single most-cited pattern in the corpus: keep the fast path independent from the thing that configures it.

• Concept

  Observability

  Logs, metrics, traces — and the unresolved debate about what belongs in each.

• Concept

  Write-Ahead Logging

  How databases, message queues, and filesystems all survive crashes the same way.

• Concept

  Eventual Consistency

  What you actually get when you scale a read-heavy system past one region.

• Concept

  Backpressure

  Unbounded queues are the most common production bug. This is how systems push back.

• Concept

  Tail Latency at Scale

  Why the p99.9 matters more than the mean, and the hedged-request playbook for taming it.

• Concept

  Blast Radius

  The discipline of designing so a single failure doesn't take everything with it.

Latest additions

1. 2026-10-01Datalex airline-retailing modernization: EJB/Java 8 → Spring Boot/Java 21 via AWS EBA + agentic AI
2. 2026-10-01Introducing Clef: our open-source decision models, and new RL fine-tuning platformCLOUDFLARE
3. 2026-10-022026 Birthday Week: network performance updateCLOUDFLARE
4. 2026-10-02Real-Time Retail Intelligence: Building E-Commerce Recommendations with Lakebase and AI Search on DatabricksDATABRICKS
5. 2026-10-01Lakebase Postgres branch-based restores for fast recovery at scaleDATABRICKS
6. 2026-10-01Introducing Workers KV Instant - powered by QuicksilverCLOUDFLARE
7. 2026-10-01Introducing Cloudflare Basin: an open, serverless data platform, now generally availableCLOUDFLARE
8. 2026-10-01Tempo 3.1: Kafka ingestion hardening, sampling-aware TraceQL metrics, query-driven trace redaction, span pruning
9. 2026-09-30Running multi-day AZ evacuation drills with ARC Zonal ShiftAWS
10. 2026-09-30A practical guide to cost optimization with Lakebase PostgresDATABRICKS
11. 2026-09-30How MHK built a HIPAA-eligible agentic AI solution on Amazon BedrockAWS
12. 2026-10-01AI Search is now generally availableCLOUDFLARE

Browse

• Reference

  Concepts — 282

  The primitives: CAP, WAL, consistent hashing, backpressure, leader election.

• Reference

  Patterns — 76

  Repeatable solutions: circuit breaker, sidecar, saga, event sourcing, outbox.

• Reference

  Systems — 1957

  Named systems in production: Dynamo, Kafka, Spanner, Borg, Colossus.

• Primary source

  Sources — 766

  Every ingested article with full metadata, tags, and backlinks.

How this works

An ingestion pipeline pulls engineering blog posts from ~30 company feeds, de-duplicates them, and runs each through a curator agent that distills the piece into structured notes and cross-links it against the existing concept graph. See the overview for the full methodology and corpus stats.

The LLM-readable catalog mirrors every page for agent consumption.