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
Back-to-school season at an online stationery shop: why on-hand stock isn't available stock, how atomic reservations stop two orders claiming the same calculator, and how shipments, cancellations and warehouse transfers stay honest.
Created 2026-09-16 · Updated 2026-10-15 · System Design
Follow Imran, a junior developer looking for his next job, through a LinkedIn-like network: how to model connections and follows, why search and feeds are projections, and how a hybrid fan-out keeps one famous post from flooding the system.
Created 2026-09-16 · Updated 2026-10-15 · System Design
What a database does between your query and the disk: ACID, isolation levels and their anomalies, B-tree and LSM storage engines, write-ahead logs, index design, query plans, connection pools, and how to choose between SQL and NoSQL.
Created 2026-09-29 · Updated 2026-10-15 · System Design
