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✅ Master Level
Sequence Diagrams
Complete Beginner → Advanced Syllabus (Pin-to-Pin)
🟢 LEVEL 1 — Foundations
1. Introduction to Sequence Diagrams
- What is a sequence diagram
- Purpose: show message flow & timing
- UML sequence diagram notation
- When to use sequence diagrams
- Stakeholders: Architects, developers, QA
2. Basic Components
- Actors & objects
- Lifelines
- Messages (synchronous & asynchronous)
- Activation boxes
- Time axis (top to bottom)
🟢 LEVEL 2 — Message Types
3. Synchronous Communication
- Method calls
- Function invocations
- Request-response patterns
- Return messages
4. Asynchronous Communication
- Event publishing
- Message queues
- Callbacks
- Fire-and-forget patterns
🟡 LEVEL 3 — Control Structures
5. Conditional Logic
- Alt (alternative/if-else)
- Opt (optional)
- Condition guards
- Multiple branches
6. Loops & Repetition
- Loop (for loop)
- Par (parallel execution)
- Break (exit condition)
- Multiple iterations
🟡 LEVEL 4 — Interaction Fragments
7. Advanced Fragments
- Neg (negative/error case)
- Strict (strict ordering)
- Ignore (ignore certain messages)
- Consider (consider important)
8. Reference & Decomposition
- Ref (reference to other diagram)
- Nested diagrams
- Modular sequences
- Reusable patterns
🟠 LEVEL 5 — User Interaction Flows
9. Frontend-Backend Sequence
- User interaction to API call
- API response handling
- State updates
- UI re-rendering
10. Error Handling Sequences
- API failure scenarios
- Retry logic
- Fallback mechanisms
- Error state display
🟠 LEVEL 6 — Service Integration
11. Microservice Interactions
- Service-to-service calls
- Multiple service collaboration
- Request aggregation
- Cascade failures
12. Distributed Transactions
- Saga pattern sequences
- Compensation logic
- Distributed tracing
- Failure recovery
🔵 LEVEL 7 — Tools & Notation
13. Diagram Tools & Formats
- PlantUML syntax
- Mermaid diagrams
- Enterprise Architect
- Visual modeling tools
14. Notation Standards
- UML compliance
- Message naming conventions
- Actor labeling
- Consistent styling
🔴 LEVEL 8 — Complex Scenarios
15. Timing & Performance
- Timing constraints
- Performance sequence analysis
- Latency identification
- Bottleneck detection
16. Concurrency & Race Conditions
- Parallel execution paths
- Race condition visualization
- Synchronization patterns
- Deadlock scenarios
🔴 LEVEL 9 — Documentation & Validation
17. Sequence Diagram Documentation
- Narrative description
- Actor responsibilities
- Message descriptions
- Assumptions & constraints
18. Validation & Review
- Completeness check
- Consistency with requirements
- Design review from diagram
- Update as changes occur
⭐ Senior Frontend Focus (Must Master)
- User interaction to API call sequence
- Loading state & error handling flow
- Pagination & data fetching sequence
- Optimistic update sequences
- Real-time update notification flows
- State management dispatch sequences
- Component lifecycle sequences