), here is a breakdown of the core pillars you need to grasp: 1. Communication Protocols This is the "language" servers use to talk. HTTP/1.1 vs. HTTP/2 vs. gRPC: Understanding the overhead of headers and the benefits of multiplexing. WebSockets: For real-time, bi-directional communication (like chat apps). TCP vs. UDP: Knowing when you need reliability (TCP) versus speed (UDP/Video streaming). 2. Execution Patterns How does the server handle a request once it arrives? Request-Response: The standard "I ask, you answer" flow. Publish-Subscribe (Pub/Sub): Using message brokers like RabbitMQ or Kafka for asynchronous tasks. Short vs. Long Polling: How the client checks for updates without a constant connection. 3. The Proxy Layer In modern backend design, the client rarely talks directly to the application server. Proxy: Acts on behalf of the client (hiding the user). Reverse Proxy: Acts on behalf of the server (Load balancing, caching, and SSL termination). Sidecars: Small helper containers that handle networking logic so your code doesn't have to. 4. Database Engines & Concurrency Where the "truth" lives. ACID vs. BASE: Choosing between strict consistency or high availability. Indexing: How to make queries fast without killing write performance. Database Partitioning/Sharding: Splitting data across multiple servers as you scale. 5. Security & TLS Backend engineering is the first line of defense. TLS Handshake: How encrypted connections are actually established. Authentication vs. Authorization: Knowing
Backend engineering involves designing, building, and maintaining the server-side components of a web application. This includes creating and managing databases, implementing server-side logic, and integrating with third-party services. The goal of backend engineering is to provide a robust, scalable, and secure foundation for web applications, ensuring a seamless user experience. udemy fundamentals of backend engineering