Modernization & Legacy Systems
Evolving systems when existing complexity starts limiting the business.
The system that has to change is the same one carrying customers and transactions right now. The transformation happens in motion or it does not happen.
When the maintenance window never comes.
Only one person understands that module
The knowledge is written nowhere, and their retirement is on the calendar.
Changing a price means touching four systems
The same rule was copied wherever it was needed, and now it lives in all of them.
The vendor left and the code stayed
Nobody chose to maintain that, but somebody has to, and the bill arrives every month.
The replacement project has been attempted twice
Rewriting everything at once needs a window the operation will never grant.
What this discipline decides.
Legacy Modernization
Finding out what the system actually does, which is usually different from what the documentation says and from what people remember.
Progressive Decomposition
Taking one piece at a time, chosen by value and by risk, instead of waiting for the full rewrite that never starts.
API Wrapping
A stable boundary in front of what is unstable, so the new can consume it without inheriting the old design.
Incremental Migration
New and legacy serving in parallel, with traffic moved gradually and a way back at every step.
Decoupling
Cutting the dependencies that force four systems to change together. It is what restores autonomy without requiring replacement.
Transformation that happens with the operation still standing.
Evolution with no maintenance window
Change stops depending on an authorisation that never comes.
Dependency spread, not concentrated
Knowledge leaves one person's head and moves into the system.
A way back at every step
Migrating gradually makes each stage reversible, and reversible is what makes it acceptable.
Running in production
You cannot shut the system down to replace it.
Tell us which old system holds your business back and we will show you how to replace it without stopping.