Backend engineering is often misconstrued as merely writing API endpoints. This paper, inspired by the teachings of software engineer Hussein Nasser, reframes backend engineering as the discipline of managing state, bandwidth, and latency under constraints. We explore the fundamental layers of backend systems: the transport (TCP/HTTP), the application logic (stateless vs. stateful), the data persistence layer (PostgreSQL, Redis), and the edge (proxies, CDNs). Special emphasis is placed on "backward engineering" (debugging live systems) and the economics of database choice. This paper serves as a condensed curriculum for engineers moving from "code that works" to "systems that survive."
The ultimate goal is not to write the most code, but to orchestrate the flow of bytes from disk to network efficiently while maintaining data integrity.
In the world of Nasser, there are no silver bullets. Every architectural decision is a double-edged sword.
The central thesis of Nasser’s work is that backend engineering is often treated as a black box. Developers know that an API returns a JSON response, and they know that a database stores data. But what happens in between? What happens when that black box is opened?