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DEVELOPMENT_ARCHITECTURE.md
Version: 1.0 Project: CeloHT Architecture Type: Modular Web3 Application Ecosystem Blockchain: Celo
This document defines the development architecture used to build, test, maintain, and extend the CeloHT ecosystem.
CeloHT is developed as a modular system where frontend applications, backend services, blockchain integrations, smart contracts, documentation, and community-impact systems can evolve independently while maintaining interoperability.
DEVELOPER
│
▼
┌───────────────┐
│ GITHUB │
│ Repositories │
└───────┬───────┘
│
▼
┌───────────────┐
│ CODE REVIEW │
│ Pull Requests │
└───────┬───────┘
│
▼
┌───────────────┐
│ CI PIPELINE │
│ │
│ Lint │
│ Test │
│ Build │
│ Security │
└───────┬───────┘
│
┌─────────────┼─────────────┐
▼ ▼ ▼
Frontend Backend Contracts
│ │ │
└─────────────┼─────────────┘
▼
INTEGRATION TESTS
│
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DEPLOYMENT
CeloHT development follows these principles:
- Open-source by default where appropriate.
- Small and reviewable changes.
- Security before convenience.
- Automated testing.
- Reproducible builds.
- Clear separation of concerns.
- Documentation alongside implementation.
- No production secrets in source control.
- Blockchain interactions must be explicit and auditable.
- Community impact remains a core product requirement.
The CeloHT ecosystem may contain multiple specialized repositories.
Representative repositories include:
Celo-HaiTi/
│
├── celoht-dapp/
├── CeloHT-Platform/
├── CeloHT-ValoraApp/
├── CeloHT-EduAgentForest/
├── celoht-education/
├── celoht-ngo-platform/
├── celoHT-website/
├── celoht-brand/
└── celoht-investor-deck/
Each repository should have a clearly defined responsibility.
A typical CeloHT web application follows:
src/
│
├── app/
├── components/
├── features/
├── lib/
├── hooks/
├── services/
├── types/
├── config/
└── tests/
The exact structure may differ between repositories.
The important architectural rule is separation between:
- UI
- Business logic
- Blockchain integration
- External services
- Data access
- Configuration
- Tests
The frontend is responsible for:
- User interfaces
- Navigation
- Wallet connection
- Transaction requests
- Educational content
- Application state
- User feedback
- Error presentation
The frontend should not contain secrets or private credentials.
Application services should isolate business operations from UI components.
Conceptually:
UI
│
▼
Application Service
│
├── Blockchain Service
├── API Service
├── Data Service
└── Analytics Service
This allows individual integrations to be replaced without rewriting the user interface.
Blockchain functionality should be isolated into dedicated modules.
Application
│
▼
Blockchain Service
│
├── Network Configuration
├── Wallet Connection
├── Contract Interface
├── Transaction Builder
└── Transaction Monitoring
The application should never scatter raw blockchain calls throughout unrelated UI components.
Smart-contract development follows:
Specification
│
▼
Implementation
│
▼
Unit Tests
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Static Analysis
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Security Review
│
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Testnet
│
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Integration Tests
│
▼
Production
Contracts should be versioned and associated with a specific deployment record.
CeloHT should distinguish:
Development
│
▼
Testing
│
▼
Staging
│
▼
Production
Each environment should have its own:
- Configuration
- RPC endpoints where appropriate
- Database credentials
- API credentials
- Deployment configuration
Production credentials must never be committed to GitHub.
Sensitive configuration should be provided through environment variables.
Examples:
DATABASE_URL
RPC_URL
NEXT_PUBLIC_NETWORK
CONTRACT_ADDRESS
API_KEY
Public configuration and secrets must be clearly distinguished.
A secret must never be exposed through a client-side environment variable.
Recommended workflow:
main
│
├── feature/*
├── fix/*
├── docs/*
└── security/*
Typical contribution flow:
Create Branch
│
▼
Implement Change
│
▼
Run Tests
│
▼
Commit
│
▼
Push
│
▼
Pull Request
│
▼
CI
│
▼
Code Review
│
▼
Merge
Commits should describe the actual change.
Examples:
feat: add wallet connection flow
fix: handle failed transaction state
docs: update architecture documentation
test: add payment integration tests
security: improve contract access control
refactor: isolate blockchain service
Pull requests should contain:
- Clear title
- Description
- Reason for the change
- Testing performed
- Screenshots for UI changes
- Security considerations where relevant
- Breaking changes where applicable
Large unrelated changes should be split into separate pull requests.
CI should automatically perform appropriate checks.
Pull Request
│
▼
GitHub Actions
│
┌───┼──────────────┐
▼ ▼ ▼
Lint Tests Security
│ │ │
└────┼──────────────┘
▼
Build
│
▼
PR Status
Recommended checks include:
- Dependency installation
- Linting
- Formatting
- Unit tests
- Integration tests
- Production build
- Dependency auditing
- Code security analysis
Testing should exist at multiple levels.
Test individual functions and components.
Test interactions between components.
Test contract interactions and transaction flows.
Test complete user workflows.
Unit
↓
Integration
↓
Blockchain
↓
End-to-End
↓
Production Verification
Dependencies should be:
- Explicitly declared
- Regularly updated
- Audited for vulnerabilities
- Removed when unnecessary
Automated dependency monitoring should be enabled where practical.
Projects should use consistent:
- Formatting
- Linting
- Type checking
- Naming conventions
- Error handling
- Documentation practices
For TypeScript applications, strict typing should be preferred where practical.
Errors should be handled at the appropriate layer.
Blockchain Error
│
▼
Service Layer
│
▼
Application State
│
▼
User-Friendly Message
Raw internal errors should not unnecessarily expose sensitive infrastructure information to users.
Logs should help developers diagnose:
- Failed API requests
- Failed transactions
- Application errors
- Deployment problems
- Authentication problems
- Integration failures
Sensitive credentials and private user information must never be logged.
Security should be integrated from the beginning.
Design
│
▼
Threat Modeling
│
▼
Implementation
│
▼
Automated Security Checks
│
▼
Code Review
│
▼
Testing
│
▼
Deployment
│
▼
Monitoring
Every significant component should document:
- Purpose
- Inputs
- Outputs
- Dependencies
- Configuration
- Security considerations
- Deployment requirements
- Known limitations
Before merging production code:
- Code compiles
- Tests pass
- Lint passes
- Type checks pass
- Build succeeds
- No secrets committed
- Dependencies reviewed
- Security implications reviewed
- Documentation updated
- Pull request reviewed
CeloHT development should evolve incrementally:
Prototype
│
▼
Validation
│
▼
Production
│
▼
Monitoring
│
▼
Optimization
│
▼
Scale
The architecture should allow new applications and services to be introduced without destabilizing existing components.
Document: Development Architecture Version: 1.0 Project: CeloHT Primary Development Platform: GitHub Blockchain: Celo
© 2026 CeloHT - Open Source. Global Impact. Licensed under Apache.