System design, AI engineering, databases, networking, concurrency and more, written for engineers building real trading and fintech systems — part of the Algomi Suite.
Follow one school library's reservation app from a single server to forty schools: requirements, estimation, scaling, storage choices, replication, consistency, CAP/PACELC, and the hashing tricks behind large-scale systems. Every idea arrives because a real problem forces it. Guide 1 of 5.
Created 2026-09-15 · Updated 2026-10-15 · System Design
A national e-textbook platform, results day, and one leaked answer key: how a CDN serves popular content close to readers, why the cache key is a correctness decision, and how to stop a stampede from flattening the origin.
Created 2026-09-16 · Updated 2026-10-15 · System Design
Sunita uploads 400 wedding photos from a train with patchy Wi-Fi. Follow them through a photo service that separates bytes from metadata, treats upload, processing and deletion as retryable workflows, and borrows one big idea from Facebook's Haystack.
Created 2026-09-16 · Updated 2026-10-15 · System Design
Where to cache, which write pattern to use, how to evict, how to invalidate, and how to survive cache stampedes, penetration, and hot keys, with the trade-offs an interviewer expects you to name.
Created 2026-09-29 · Updated 2026-10-15 · System Design
How to stop one company's documents leaking into another company's answers: tenant isolation at ingestion, retrieval, context assembly and caching, and how to choose between a shared index, namespaces and dedicated indexes.
Created 2026-10-04 · Updated 2026-10-15 · AI Solutions Architecture & AI Engineering
