Design Principles
Learn SOLID, DRY, KISS, YAGNI, and other principles for building maintainable software.
At senior levels, design reviews and architecture discussions separate engineers who can name why a design is wrong from those who default to "it works." Rigid codebases, endless refactors, and circular debates are usually symptoms of missing shared language—SOLID, DRY, and the classic patterns.
These topics give you that language: when each principle and pattern applies, how to spot violations in real code, and how to articulate trade-offs. You'll signal judgment and clarity whether you're proposing a design in a review or defending choices in an interview.
Topics in this category
Builder Pattern
Read →Learn the Builder pattern: construct complex objects step by step. Separate construction from representation and create objects with many optional parameters.
Adapter Pattern
Read →Learn the Adapter pattern: allow incompatible interfaces to work together. Convert class interfaces into formats clients expect for seamless integration.
Command Pattern
Read →Learn the Command pattern: encapsulate a request as an object, allowing you to parameterize clients with different requests, queue operations, and support undo.