Many companies depend on systems that are 10, 15, or 20 years old. Modernizing doesnt mean throwing everything away.
Modernization strategies
Strangler Fig Pattern
New features are built in a modern system while the old one keeps running. Gradually, features migrate until the legacy system can be turned off.
API wrapper
The legacy system is wrapped with modern APIs, allowing new systems to integrate without touching old code.
Progressive data migration
Data migrates module by module, validating consistency at each step.
What NOT to do
- Rewrite everything at once
- Migrate without mapping current processes
- Ignore historical data
- Not involve users in the process
