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✅ Master Level
Data Flow & BFF Architecture
Complete Beginner → Advanced Syllabus (Pin-to-Pin)
🟢 LEVEL 1 — Data Flow Basics
1. Frontend Data Flow Fundamentals
- Data request initiation
- Fetching patterns
- Loading states
- Error handling
2. API Communication
- Fetch API
- Axios libraries
- HTTP methods usage
- Request headers & authentication
🟢 LEVEL 2 — Caching Strategies
3. Client-Side Caching
- Browser cache headers
- Memory caching
- localStorage & sessionStorage
- IndexedDB for large data
4. Cache Invalidation
- TTL (Time-to-Live)
- Event-based invalidation
- Stale-while-revalidate
- Cache coherence strategies
🟡 LEVEL 3 — BFF Concept
5. Backend-for-Frontend Definition
- What is BFF
- Frontend-specific endpoints
- Decoupling frontend from backend
- API tailoring for UI needs
6. BFF Implementation
- Node.js BFF server
- Data aggregation layer
- Response transformation
- Authentication pass-through
🟡 LEVEL 4 — API Orchestration
7. Multi-Backend Integration
- Calling multiple backend services
- Data aggregation
- Parallel request execution
- Error handling across services
8. Orchestration Patterns
- Chained requests
- Fan-out patterns
- Timeout & retry strategies
- Circuit breaker patterns
🟠 LEVEL 5 — GraphQL Integration
9. GraphQL Client Setup
- Apollo Client
- Urql setup
- Query writing
- Cache management
10. GraphQL Data Fetching
- Query execution
- Mutation handling
- Subscription setup
- Error handling
🟠 LEVEL 6 — Optimistic Updates
11. Optimistic UI Updates
- Immediate UI feedback
- Rollback on failure
- Conflict resolution
- State consistency
12. Implementation Patterns
- Pending state management
- Temporary IDs
- Undo functionality
- Conflict markers
🔵 LEVEL 7 — Reactive Data Architecture
13. Real-time Data Sync
- WebSocket connections
- Server push updates
- Client-side merging
- Connection management
14. Publish-Subscribe in Frontend
- Event emitters
- Observable patterns
- RxJS operators
- Memory leak prevention
🔵 LEVEL 8 — Data Consistency
15. Handling Eventual Consistency
- Stale data display
- Verification indicators
- Conflict detection
- User education
16. Offline-First Patterns
- Service workers
- Sync queue management
- Persistence layers
- Conflict resolution offline
🔴 LEVEL 9 — Advanced Data Flow
17. Performance Optimization
- Request deduplication
- Batch requests
- Pagination strategies
- Prefetching & preloading
18. Monitoring & Observability
- API performance tracking
- Cache hit/miss rates
- Network waterfall analysis
- User experience metrics
⭐ Senior Frontend Focus (Must Master)
- Designing BFF architectures
- API orchestration patterns
- Cache strategy design for user experience
- Optimistic update implementation
- Real-time data sync architecture
- Handling offline scenarios
- Data flow observability