Use cases
Define behavior, constraints, and the interactions your design must support.
Explore practiceLOW-LEVEL SYSTEM DESIGN
Clear responsibilities.
Better software.
Translate requirements into components that make sense. Practice classes, interfaces, and interactions with an emphasis on maintainability and change.
Your learning. Your pace. A clearer next step.
YOUR PRACTICE PATH
- 01Describe the behaviorWork through use cases and identify the objects that have responsibilities.
- 02Design the contractsDefine interfaces and show how components collaborate.
- 03Test a changeWalk through an example, handle invalid inputs, and explain how the design evolves.
BUILD YOUR FOUNDATIONS
Know the ideas.
Put them to work.
Explore the concepts behind low-level system design, then apply them in the practice library.
Classes & interfaces
Assign responsibilities and create contracts between components.
Explore practiceSOLID principles
Use design principles where they solve a concrete problem.
Explore practiceDesign patterns
Compare patterns against the behavior and change you expect.
Explore practiceUML & interactions
Communicate relationships, sequences, and state transitions.
Explore practiceExtensibility & testing
Reason about validation, edge cases, and evolving requirements.
Explore practiceA MORE THOUGHTFUL SESSION
Make every attempt
teach you something.
Practice is most useful when you can explain what changed in your understanding. Build that habit into every session.
Choose your next challenge01 / Describe the behavior
Work through use cases and identify the objects that have responsibilities.
02 / Design the contracts
Define interfaces and show how components collaborate.
03 / Test a change
Walk through an example, handle invalid inputs, and explain how the design evolves.
KEEP EXPLORING