📋 Executive Summary

This article chronicles my experience using AI-assisted development to migrate a legacy 2000-line monolithic component into a modern, maintainable architecture. While this example focuses on a React messaging interface, the principles and techniques apply to any large-scale refactoring project.

The Challenge:

  • 2000+ lines of tightly coupled code
  • 50+ state variables in one component
  • 30% test coverage
  • 15% bug introduction rate
  • 2-3 days to add simple features

The AI-Assisted Solution:

  • 8-12 week timeline (vs 15+ weeks manual)
  • 60% architecture design by AI
  • 80% documentation generated by AI
  • 40% code generation by AI
  • 85% test coverage achieved
  • 40% reduction in code complexity

💡 Key Insight: AI didn’t replace me—it amplified my c…

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