Easy Learn
A plain-language guide to the two most fundamental types of load balancing: static (round robin, weighted round robin, random, source IP hash, URL hash) and dynamic (least connections, weighted least connections, least response time, resource-based). Covers each algorithm in turn, a side-by-side comparison, real performance impact, how to choose between…
A plain-language, complete guide to horizontal partitioning: what it really is, how it differs from vertical partitioning, a short history, why it matters, the building blocks (parent table, partitions, partition key, routing logic), common strategies (range, hash, list, round-robin, composite, consistent hashing), how it relates to sharding, real-world uses, partition…
A plain-language, complete guide to back-of-the-envelope estimation: what it really is, where the name comes from, why interviewers care, the foundational numbers to keep in your back pocket, the common types of estimation, a repeatable six-step process, two fully worked examples (a photo-sharing app and a URL shortener), handy rules…
A plain-language, complete guide to idempotency in distributed systems: what it really is, where the idea comes from, why retries happen at all, how it maps onto HTTP methods and delivery guarantees, how idempotency keys work step by step, other complementary techniques, two fully worked examples (a coffee-shop payment and…
A plain-language, complete guide to microservices architecture: what it is, where the idea came from, how it compares to a monolith, the anatomy of a single microservice, how services communicate, how data is managed across many services, the supporting cast of gateways and meshes, security considerations, a fully worked bookstore…
A plain-language, complete guide to vertical partitioning: what it is, how it differs from horizontal partitioning, why it matters, the building blocks, its relationship to normalisation, two fully worked SQL examples, how the same idea appears in NoSQL, real-world uses, honest advantages and disadvantages, how to choose where to split,…
A friendly, complete guide to High-Level Design (HLD): what it is, why every serious project needs one, how it differs from LLD and requirements, the building blocks, quality goals, architecture styles, a worked food-delivery example, pitfalls to avoid, tools of the trade, HLD in interviews, and a reusable template.
A plain-English guide to High-Level Design (HLD): what belongs on the big-picture map, how it differs from LLD and requirements, common architecture styles, a worked food-delivery example, pitfalls to avoid, and a reusable template.
A plain-English guide to Low-Level Design: classes, relationships, SOLID principles, design patterns, UML, a worked parking-lot example, and how good LLD turns a big-picture plan into code a team can actually build.
A plain-English guide to the very first move in a system design interview: ask clarifying questions. Includes a five-phase framework, a worked URL shortener example, common mistakes to avoid, and how to practise before the real thing.