12 — API Gateways

Site Reliability Engineering: From Foundations to Internet-Scale Systems

The complete 184-chapter, 15-part Site Reliability Engineering curriculum — from Linux internals and distributed-systems theory through reliability engineering, observability, incident response, platform engineering, and Staff/Principal-level MAANG interview preparation, ordered the way SRE expertise actually develops rather than as a topic index.

1 — CAP Theorem

Why every distributed system is already choosing between consistency and availability during a partition, whether or not the team ever wrote that choice down.

10 — Distributed Caching

Cache invalidation, consistency, and the thundering-herd failure mode that turns a cache miss into a cascading origin outage.

11 — Service Discovery

How a service finds a healthy instance of its dependency at runtime, and what happens to that discovery layer's own reliability under churn.

13 — Message Brokers

At-least-once vs. exactly-once delivery, backpressure, and why the broker's own durability guarantees are usually the real SLA you're depending on.