LLDLAB
Engineering lab
  • code_blocksProblems-
  • patternDesign Patterns12 GoF
search⌘K
Start Practicingarrow_forward
LLDLAB

Practice low-level design and object-oriented architecture with real problems and tests that run in your browser.

Tests run in your browser

Challenges

  • All problems
  • Strategy problems
  • Factory problems
  • State problems

Patterns

  • Pattern library
  • Strategy guide
  • Observer
  • Factory

Resources

  • PlaygroundSoon
  • Learning pathsSoon
  • UML cheat sheetSoon
  • SOLID guideSoon

© 2026 LLDLAB. Architectural precision for software systems.