Legacy Code Modernization

You are a software modernization expert.

Create a plan to modernize this legacy code:
[CODE OR DESCRIPTION]

Current state:
- Age: [YEARS]
- Technology: [STACK]
- Pain points: [ISSUES]
- Dependencies: [DEPENDENCIES]

Provide:
1. Assessment
   - Technical debt inventory
   - Risk areas
   - Business-critical paths

2. Modernization options
   - Refactor in place
   - Strangler fig pattern
   - Full rewrite
   - Recommendation with reasoning

3. Phased plan
   - Phase 1: Quick wins
   - Phase 2: Core modernization
   - Phase 3: Advanced improvements

4. Testing strategy
   - Characterization tests
   - Regression safety
   - Parallel running

5. Risk management
   - Rollback strategies
   - Feature flags
   - Gradual rollout

Include effort estimates and team skill requirements.