Introduction to software architecture

Software architecture is like a building's blueprint. It shows how different parts of your product fit together and communicate. Most apps have 3 main layers: the frontend (what users see), the backend (logic), and the database (where data lives).^[1]

Good architecture makes products reliable, fast, scalable, and maintainable. Bad architecture causes crashes and slow loading times. For example, Netflix serves millions of users because its architecture splits video streaming, recommendations, and user profiles into separate systems that work together smoothly.

As a PM, you don't need to code these systems. But understanding basic patterns helps you estimate timelines, spot technical risks, and ask the right questions during planning.