Software Architecture basics

Software architecture main requirements:

• User requirements
• Business requirements
• IT System requirements

Software architecture key principles:

• minimize complexity
• separation of concerns
• single responsibility principle
• principle of least knowledge
• don't repeat yourself
• minimize upfront design

General guidelines:

• no duplicate functionality
• consistent patterns in your layers
• composition over inheritance
• use code conventions

Layer guidelines

• separate areas of concern
• clearly define communication between layers
• use abstraction to loosely couple layers
• don't mix different types of components in a layer
• use consistent data formatting within layers

Component guidelines

• No component should rely on the internals of another
• Do not mix roles in a single components
• Define clear contracts for components
• Abstract system wide components away from other layers