Easy Learn
A complete, plain-language guide to Service-Level Agreements (SLAs): what they are and where they came from, the business problem they solve, core vocabulary and precision (why 99.9% vs 99.99% matters), the eight-part anatomy of a real SLA document with a sample clause, the three distinct SLA / SLO / SLI…
A complete, beginner-friendly guide to the real reason behind the whiteboard in a system design interview. Covers: a short history of the whiteboard round, why words alone fail, what interviewers are secretly evaluating, the core vocabulary (system design, architecture diagram, component, data flow), the anatomy of a great high-level diagram…
A complete, beginner-to-advanced tutorial on when to stay with a monolith instead of splitting into microservices. Covers the one-house vs small-city analogy and the full 1990s-through-mid-2020s history (single monolith, SOA, microservices popularised at Netflix and Amazon, the industry-wide adoption boom, then the correction toward modular monoliths); the real motivations for…
A complete, beginner-to-advanced guide to finding the one slow component that limits a whole system: the honey-bottle analogy and why bottleneck hunting separates senior engineers from junior ones; five reasons systems develop bottlenecks over time (traffic growth, data growth, hidden feature work, contested shared resources, hardware limits); precise vocabulary (latency,…
A plain-language, ground-up guide to the biggest architecture decision most software teams ever make. Covers the history and motivation, core concepts (coupling, cohesion, bounded contexts, CAP, latency vs throughput), monolith and microservices architectures with worked bookstore examples, request lifecycles, honest advantages and trade-offs, performance and scalability, high availability and failure…
A complete, beginner-to-production tutorial on the distributed monolith: the most common failure mode in modern software architecture, where a system is physically split into services but stays logically coupled like a single application. Covers the LEGO-castle analogy and the 1990s-through-present timeline (single monolith, SOA / ESB, microservices at Netflix and…
A complete, plain-language guide to single points of failure (SPOF): the village-bridge and one-legged-table analogy, what a SPOF really is (defined by consequence, not probability), a short history from bridge and ship builders through early computer networks, why SPOFs happen at all (starting small, cost pressure, time pressure, invisible growth),…
A complete, plain-language guide to health checks: the big idea told through a busy-restaurant analogy, what a health check really is (a small, repeated endpoint that returns a short honest answer), why it matters for early warning / self-healing / safer updates / trust, how it actually works through pull…
A complete, plain-language guide to failover: the big idea told through a relay-race analogy, what failover really means and how it differs from a switchover, why it matters so much for trust / money / safety / peace of mind, how systems notice trouble using heartbeats and health checks with…
A complete, plain-language guide to synchronous versus asynchronous communication: introduction and a little history from single-machine programs to the modern internet, the exact problem the choice solves, the phone-call versus letter analogy, twelve core terms (client, server, request, response, blocking, non-blocking, callback, latency, throughput, message queue, event, coupling), what synchronous…