Easy Learn
A complete, ground-up guide to High Availability infrastructure design — the discipline of accepting that every component eventually breaks and building systems that keep serving users anyway. Nineteen sections walk from historical roots (telephone exchanges, mainframes, “always-on” web architecture) through the full HA vocabulary (redundancy, SPOF, failover, active-active, replication, health…
A ground-up, beginner-to-production guide to the main HTTP methods used in REST APIs – GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. Covers the history from HTTP/0.9 through RFC 7231 and 5789, the three foundational properties (safe, idempotent, cacheable) that classify every method, how servers dispatch methods internally in frameworks…
A complete, beginner-to-production guide to infrastructure drift: what it is, why it happens, how to detect it with Terraform / CloudFormation / Pulumi / GitOps, real Java examples of a drift checker exposed as a Spring Boot service, and lessons from Netflix, AWS, Google, and HashiCorp on running drift-aware infrastructure at scale.
A beginner-friendly, deep-dive guide to load testing tools — what they do, how they work internally, how to script them (k6, Locust, JMeter, Gatling), how to run them in CI/CD, and how the biggest engineering teams (Netflix, Amazon, Uber, banks and ticketing platforms) rely on them to survive their peak-traffic…
A beginner-friendly, deep-dive guide to Continuous Deployment: the history from Extreme Programming and Flickr’s “10+ Deploys a Day” to Amazon’s 11.7-seconds-between-deploys statistic; how CD differs from Continuous Integration and Continuous Delivery; the architecture of a modern CD pipeline; canary releases, blue-green, feature flags and automated rollback; DORA metrics; GitOps with…
A beginner-to-production deep dive into the two most confused terms in modern software delivery — what Continuous Delivery and Continuous Deployment really mean, how the pipelines work inside, the trade-offs, and how organisations like Netflix, Amazon, Etsy and Google ship code hundreds of times a day with automated rollback safety nets.
A ground-up, beginner-to-production guide to API key management: what API keys are and where they came from historically as the programmable web took off in the mid-2000s, the problems they solve for machine-to-machine traffic (identification, rate limiting, revocation, accountability, billing and metering), core vocabulary (API key, hash, scope, rate limit,…
A complete beginner-to-production guide to the cache-aside (lazy loading) pattern: what it is, its history from CPU hardware caches in the 1980s through Facebook popularizing Memcached-in-front-of-MySQL in the 2000s, the problem of database bottlenecks and hot-key traffic, core vocabulary (cache, hit, miss, TTL, invalidation, key-value store, LRU with hashmap +…
A complete beginner-to-production guide to cache eviction: what it is, its 1960s hardware-cache origins with Maurice Wilkes and the memory wall, the problem of finite fast memory, core vocabulary (hit, miss, capacity, eviction, policy, TTL, invalidation, working set, hit ratio), cache architecture and components, all major eviction algorithms with Java…
A complete beginner-to-production guide to API gateway rate limiting: what it is, its history from 1980s telco traffic shaping to modern cloud gateways, the four core algorithms (fixed window, sliding window, token bucket, leaky bucket) with full Java reference implementations, the request lifecycle through gateway and Redis counter store, the…