System design, AI engineering, databases, networking, concurrency and more, written for engineers building real trading and fintech systems — part of the Algomi Suite.
From one guesthouse in Goa to 80,000 hotels: how a booking system claims every night of a stay exactly once, keeps payment uncertainty away from inventory, and stops two guests winning the same room. Includes the three follow-up questions interviewers use to separate good answers from great ones.
Created 2026-09-16 · Updated 2026-10-15 · System Design
A monsoon power flicker hits a village ATM just as ₹10,000 slides out. How do you design a withdrawal that survives a network failure between the bank's authorization and the machine dispensing cash, when cash can never be rolled back?
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
