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docs/lessons-learned/003-requirements-file-organization.md

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+# Lesson Learned #003: Requirements File Organization
+
+## Issue Name
+Missing main requirements.txt for local development and testing
+
+## Description
+After implementing comprehensive test coverage, tests could not be run locally due to missing dependencies. The project had separate `requirements-backend.txt` and `requirements-frontend.txt` files for Docker containers, but no unified requirements file for local development.
+
+## Error Messages
+```
+ModuleNotFoundError: No module named 'structlog'
+ModuleNotFoundError: No module named 'pytest'
+```
+
+## Root Cause
+1. **Fragmented Dependencies**: Backend and frontend requirements were split into separate files for Docker optimization
+2. **Missing Local Setup**: No unified requirements file for local development and testing
+3. **Documentation Gap**: README didn't clearly explain how to install dependencies for local testing
+
+## Solution Implemented
+
+### 1. Created Main Requirements File
+- **File**: `requirements.txt`
+- **Purpose**: Combined all dependencies for local development
+- **Content**: Merged backend and frontend requirements
+
+### 2. Created Development Requirements File  
+- **File**: `dev-requirements.txt`
+- **Purpose**: Testing and development dependencies only
+- **Content**: pytest, black, flake8, mypy, and core dependencies needed for testing
+
+### 3. Updated Documentation
+- **File**: `README.md`
+- **Section**: Quick Start
+- **Addition**: Local development setup instructions with proper pip install commands
+
+### 4. Maintained Docker Optimization
+- **Approach**: Kept separate `requirements-backend.txt` and `requirements-frontend.txt` for Docker containers
+- **Benefit**: Smaller container images with only necessary dependencies
+
+## File Structure Created
+```
+job-forge/
+├── requirements.txt              # All dependencies for local development
+├── dev-requirements.txt          # Development and testing dependencies only
+├── requirements-backend.txt      # Backend container dependencies (existing)
+├── requirements-frontend.txt     # Frontend container dependencies (existing)
+└── README.md                    # Updated with local setup instructions
+```
+
+## Prevention Strategy
+
+### 1. Requirements File Standards
+- **Main Requirements**: Always maintain a unified `requirements.txt` for local development
+- **Development Requirements**: Separate `dev-requirements.txt` for testing tools
+- **Container Requirements**: Keep optimized files for Docker containers
+
+### 2. Documentation Requirements
+- **Installation Instructions**: Clear pip install commands in README
+- **Testing Setup**: Document how to run tests locally vs in containers
+- **Dependencies Explanation**: Explain the purpose of each requirements file
+
+### 3. Testing Integration
+- **Local Testing**: Ensure tests can run with local pip-installed dependencies
+- **Container Testing**: Maintain ability to test within Docker environment
+- **CI/CD Integration**: Use appropriate requirements file for each environment
+
+## Implementation Details
+
+### Requirements.txt Content
+```
+# Combined requirements for local development
+fastapi==0.109.2
+uvicorn[standard]==0.27.1
+# ... (all backend and frontend dependencies)
+pytest==8.0.2
+pytest-asyncio==0.23.5
+# ... (all testing dependencies)
+```
+
+### Dev-Requirements.txt Content
+```
+# Development and testing only
+pytest==8.0.2
+pytest-asyncio==0.23.5
+pytest-cov==4.0.0
+black==24.2.0
+# ... (minimal set for testing)
+```
+
+### README Update
+```bash
+# For local development and testing
+pip install -r requirements.txt
+
+# For development dependencies only  
+pip install -r dev-requirements.txt
+
+# Run tests locally
+python validate_tests.py
+python run_tests.py
+pytest
+```
+
+## Key Takeaways
+
+1. **Multiple Requirements Files**: Different environments need different dependency sets
+2. **Local Development Priority**: Always provide easy local setup for developers
+3. **Documentation Clarity**: Clear installation instructions prevent frustration
+4. **Container Optimization**: Keep container-specific requirements minimal and focused
+
+## Status
+✅ **RESOLVED** - Created unified requirements files and updated documentation
+
+## Related Files
+- `requirements.txt` (new)
+- `dev-requirements.txt` (new) 
+- `README.md` (updated)
+- `requirements-backend.txt` (existing, unchanged)
+- `requirements-frontend.txt` (existing, unchanged)