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LLDsystem_design~12 mins

YAGNI (You Aren't Gonna Need It) in LLD - Architecture Diagram

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System Overview - YAGNI (You Aren't Gonna Need It)

The YAGNI principle means you should only build what is necessary right now. Avoid adding extra features or complexity that might never be used. This keeps systems simple, easier to maintain, and faster to deliver.

Architecture Diagram
User
  |
  v
Simple Service
  |
  v
Database
Components
User
actor
Initiates requests to the system
Simple Service
service
Handles only required features without extra complexity
Database
database
Stores necessary data for current features
Request Flow - 4 Hops
User → Simple Service
Simple Service → Database
Database → Simple Service
Simple Service → User
Failure Scenario
Component Fails:Simple Service
Impact:System cannot process user requests or access data
Mitigation:Keep service simple to reduce bugs; use monitoring and quick rollback to previous stable version
Architecture Quiz - 3 Questions
Test your understanding
What does YAGNI encourage developers to avoid?
AWriting any code at all
BAdding unnecessary features before they are needed
CUsing databases in the system
DTesting the system thoroughly
Design Principle
YAGNI promotes building only what is necessary to reduce complexity, improve maintainability, and speed up delivery by avoiding premature optimization or feature additions.