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+# SMOA System Architecture
+
+**Version:** 1.0  
+**Last Updated:** 2024-12-20  
+**Status:** Draft - In Progress
+
+---
+
+## System Overview
+
+The Secure Mobile Operations Application (SMOA) is a hardened Android-based application designed for deployment on approved foldable mobile devices. SMOA enables identity presentation, secure internal routing, and mission communications in connected, disconnected, and degraded environments.
+
+### System Purpose
+SMOA provides secure mobile operations capabilities for government and military personnel, including:
+- Digital credential presentation
+- Secure communications
+- Orders management
+- Evidence chain of custody
+- Regulatory reporting
+- Domain-specific operations (law enforcement, military, judicial, intelligence)
+
+### System Context
+SMOA operates in a secure mobile environment with:
+- **Operating System:** Android (enterprise-hardened builds)
+- **Device Class:** Foldable smartphones with biometric hardware support
+- **Deployment Model:** Government-furnished or government-approved devices under MDM/UEM control
+- **Connectivity:** Online, offline, and degraded modes
+
+---
+
+## Architecture Principles
+
+### Security First
+- Multi-factor authentication required
+- Hardware-backed encryption
+- Zero-trust architecture principles
+- Defense in depth
+
+### Resilience
+- Offline operation capability
+- Degraded mode support
+- Data synchronization
+- Automatic recovery
+
+### Compliance
+- Standards-based implementation
+- Compliance by design
+- Audit trail throughout
+- Certification ready
+
+### Modularity
+- Modular architecture
+- Clear module boundaries
+- Well-defined interfaces
+- Reusable components
+
+---
+
+## High-Level Architecture
+
+### System Components
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    SMOA Application                          │
+├─────────────────────────────────────────────────────────────┤
+│                                                               │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐       │
+│  │   Core       │  │   Core       │  │   Core       │       │
+│  │   Modules    │  │   Modules    │  │   Modules    │       │
+│  │   (8)        │  │   (8)        │  │   (8)        │       │
+│  └──────────────┘  └──────────────┘  └──────────────┘       │
+│                                                               │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐       │
+│  │   Feature    │  │   Feature    │  │   Feature    │       │
+│  │   Modules    │  │   Modules    │  │   Modules    │       │
+│  │   (13)       │  │   (13)       │  │   (13)       │       │
+│  └──────────────┘  └──────────────┘  └──────────────┘       │
+│                                                               │
+│  ┌──────────────────────────────────────────────────────┐  │
+│  │         Common Infrastructure                         │  │
+│  │  - Authentication  - Security  - Database            │  │
+│  │  - Networking     - Storage   - Logging             │  │
+│  └──────────────────────────────────────────────────────┘  │
+└─────────────────────────────────────────────────────────────┘
+```
+
+### Core Modules (8)
+1. **core:auth** - Authentication framework
+2. **core:security** - Security infrastructure
+3. **core:common** - Common utilities
+4. **core:barcode** - PDF417 barcode generation
+5. **core:as4** - AS4 gateway messaging
+6. **core:eidas** - eIDAS compliance
+7. **core:signing** - Digital signatures & seals
+8. **core:certificates** - Certificate management
+
+### Feature Modules (13)
+1. **modules:credentials** - Issued credentials
+2. **modules:directory** - Internal directory
+3. **modules:communications** - Unit communications
+4. **modules:meetings** - Secure meetings
+5. **modules:browser** - Controlled browser
+6. **modules:orders** - Orders management
+7. **modules:evidence** - Evidence chain of custody
+8. **modules:reports** - Report generation
+9. **modules:atf** - ATF form support
+10. **modules:ncic** - NCIC/III integration
+11. **modules:military** - Military operations
+12. **modules:judicial** - Judicial operations
+13. **modules:intelligence** - Intelligence operations
+
+---
+
+## Component Architecture
+
+### Authentication Component
+- Multi-factor authentication (PIN + Fingerprint + Facial Recognition)
+- Session management
+- Re-authentication triggers
+- Hardware-backed key storage
+
+### Security Component
+- Encryption (at rest and in transit)
+- Key management
+- Certificate management
+- Audit logging
+- Policy enforcement
+
+### Data Storage Component
+- Room database (local SQLite)
+- Encrypted storage
+- Offline data caching
+- Data synchronization
+
+### Network Component
+- Secure communication (TLS)
+- VPN support
+- Offline mode detection
+- Degraded mode handling
+
+---
+
+## Module Architecture
+
+### Module Structure
+Each module follows a consistent structure:
+- **Domain Layer:** Business logic and data models
+- **Data Layer:** Database and repositories
+- **Presentation Layer:** UI components (Jetpack Compose)
+- **Service Layer:** Business services
+
+### Module Dependencies
+- Core modules have no dependencies on feature modules
+- Feature modules depend on core modules
+- Clear dependency hierarchy
+- Minimal inter-module dependencies
+
+---
+
+## Data Architecture
+
+### Data Model
+- **Room Database:** Primary local storage
+- **Encrypted Storage:** Sensitive data encryption
+- **Offline Cache:** Time-bounded offline data
+- **Synchronization:** Data sync on connectivity
+
+### Data Flow
+1. User input → Domain layer
+2. Domain layer → Data layer (persistence)
+3. Data layer → Domain layer (retrieval)
+4. Domain layer → Presentation layer (display)
+
+### Data Protection
+- Encryption at rest (hardware-backed)
+- Encryption in transit (TLS)
+- Access control (RBAC)
+- Audit logging
+
+---
+
+## Integration Architecture
+
+### External System Integrations
+- **AS4 Gateway:** Inter-agency messaging
+- **NCIC/III:** Law enforcement databases
+- **ATF eTrace:** Firearms tracing
+- **QTSP:** Qualified Trust Service Providers
+- **Timestamping Authority:** Qualified timestamps
+
+### Integration Patterns
+- RESTful APIs
+- AS4 messaging
+- Secure file transfer
+- Certificate-based authentication
+
+---
+
+## Deployment Architecture
+
+### Deployment Model
+- **Device:** Government-furnished foldable Android devices
+- **MDM/UEM:** Mobile device management
+- **Backend Services:** Enterprise backend (if applicable)
+- **Network:** Secure government networks
+
+### Infrastructure Requirements
+- Android 7.0+ (API 24+)
+- Biometric hardware support
+- Hardware-backed key storage
+- Network connectivity (with offline support)
+
+---
+
+## Technology Stack
+
+### Platform
+- **Language:** Kotlin
+- **Platform:** Android
+- **Minimum SDK:** 24 (Android 7.0)
+- **Target SDK:** 34 (Android 14)
+
+### Core Libraries
+- **UI:** Jetpack Compose
+- **Database:** Room
+- **Networking:** Retrofit, OkHttp
+- **Dependency Injection:** Hilt
+- **Security:** Android Keystore, BouncyCastle
+- **Barcode:** ZXing
+- **PDF:** PDFBox or iText
+
+### Development Tools
+- **IDE:** Android Studio
+- **Build System:** Gradle
+- **Version Control:** Git
+- **CI/CD:** (To be determined)
+
+---
+
+## Security Architecture
+
+See [Security Architecture Document](SECURITY_ARCHITECTURE.md) for detailed security architecture.
+
+### Key Security Features
+- Multi-factor authentication
+- Hardware-backed encryption
+- Secure key storage
+- Encrypted communication
+- Audit logging
+- Policy enforcement
+
+---
+
+## Performance Considerations
+
+### Optimization Strategies
+- Lazy loading
+- Caching
+- Background processing
+- Efficient database queries
+- Image optimization
+
+### Performance Targets
+- Application startup: < 3 seconds
+- Screen transitions: < 300ms
+- API response: < 2 seconds
+- Database queries: < 100ms
+
+---
+
+## Scalability
+
+### Current Scope
+- Single device deployment
+- Local data storage
+- Offline-first architecture
+
+### Future Considerations
+- Multi-device synchronization
+- Cloud backend integration
+- Enterprise deployment
+
+---
+
+## Diagrams
+
+### System Architecture Diagram
+[To be added: PlantUML or image]
+
+### Component Architecture Diagram
+[To be added: PlantUML or image]
+
+### Module Dependency Diagram
+[To be added: PlantUML or image]
+
+### Data Flow Diagram
+[To be added: PlantUML or image]
+
+---
+
+## References
+
+- [Specification](../SPECIFICATION.md)
+- [Security Architecture](SECURITY_ARCHITECTURE.md)
+- [Implementation Status](../IMPLEMENTATION_STATUS.md)
+- [Compliance Matrix](../COMPLIANCE_MATRIX.md)
+
+---
+
+**Document Owner:** Technical Lead  
+**Last Updated:** 2024-12-20  
+**Status:** Draft - In Progress  
+**Next Review:** 2024-12-27
+