Guides
Modernization Overview
Complete guide to modernizing your codebase with AI. Index of all migration paths, best practices, and readiness checklist for AI agentic transformation.
Related Skills: Accelerate your modernization journey with specialized skills from Skilled. Browse language-specific migration skills, framework migration skills, and modernization workflows to transform your codebase efficiently.
Migration Guide Index
Choose your modernization path from our comprehensive collection of guides:
Language Modernization
Java Modernization
Java 8 to 17+, Spring Boot upgrades, dependency management
Python Modernization
Python 2 to 3, Django/Flask to FastAPI, type hints
.NET Modernization
.NET Framework to .NET 8+, ASP.NET to ASP.NET Core
Node.js/JavaScript
Legacy JS to ES2022+, callbacks to async/await
PHP Modernization
PHP 5/7 to PHP 8+, Laravel/Symfony upgrades
Ruby/Rails
Ruby 1.9/2.x to Ruby 3+, Rails upgrades
COBOL Modernization
Mainframe to cloud-native, COBOL to Java/Python
Infrastructure & Architecture
Database Modernization
Oracle/SQL Server to PostgreSQL, schema migration
Legacy Migration
Monolith to microservices, on-prem to cloud
Code Modernization
General best practices, assessment, planning
Quality & Security
Modernization Best Practices
Follow these proven practices to ensure successful modernization projects:
Assessment First
- Inventory your codebase: Map all languages, frameworks, and dependencies
- Identify critical paths: Understand which systems are business-critical
- Measure technical debt: Use automated tools to quantify complexity and risk
- Estimate effort: Create realistic timelines based on codebase size and complexity
Incremental Approach
- Start small: Begin with low-risk modules to build confidence
- Parallel execution: Use Git worktrees to modernize multiple modules simultaneously
- Frequent checkpoints: Create git commits at regular intervals for easy rollback
- Continuous testing: Run tests after each change to catch regressions early
Team Preparation
- Upskill team: Train developers on target technologies before migration
- Establish standards: Define coding standards for the modernized codebase
- Set up CI/CD: Ensure automated testing and deployment pipelines are ready
- Document decisions: Record architectural decisions and rationale
Risk Mitigation
- Maintain parity: Keep old and new systems running in parallel during transition
- Data validation: Verify data integrity after database migrations
- Performance testing: Benchmark old vs new systems to ensure no degradation
- Rollback plan: Have documented rollback procedures for each phase
AI Agentic Readiness Checklist
Prepare your codebase for AI-assisted modernization by completing these prerequisites:
Code Quality Prerequisites
Documentation Prerequisites
Infrastructure Prerequisites
AI-Specific Prerequisites
Security Prerequisites
Getting Started Steps
Follow this step-by-step process to begin your modernization journey:
- Choose your migration path: Select the appropriate guide from the index above based on your technology stack
- Run the readiness checklist: Complete the AI Agentic Readiness Checklist above
- Install relevant skills: Browse Skilled and install skills for your specific modernization needs
- Initialize Autohand: Run
autohand initin your project directory - Run assessment: Use the assessment commands in your chosen guide to understand scope
- Create a plan: Generate a modernization roadmap with phases and milestones
- Start with a pilot: Choose a low-risk module for your first modernization iteration
- Validate and iterate: Test thoroughly, gather feedback, and refine your approach
- Scale up: Expand to additional modules using proven patterns from the pilot
- Monitor and optimize: Track metrics and continuously improve your process