Modernize without stopping the business.
The problem
Nobody dares to touch it anymore.
The system has run for fifteen years and carries half the business. Which is exactly why everyone is afraid of it.
The one developer
Only one person still understands the code. Sometimes they are already retired, and their number hangs on the notice board.
Every change is a gamble
One small adjustment, three new bugs. Releases happen on weekends, with held breath.
The technology locks you in
Old versions without updates, no interfaces, security holes. And young developers politely decline.
The path
Replace it while everything keeps running.
No big bang, no parallel project running for years. The new system grows around the old one and takes over one area after another.
Understand & secure
Inventory, backups and tests around the existing behavior – including the unwritten parts.
Put a facade in front
A new interface goes in front of the old system. From now on, all traffic runs through one place.
Replace module by module
Behind the facade, one area gets rebuilt and switched over. The rest doesn't notice.
Verify in parallel
Old and new both run for a while. Deviations show up immediately, not at year-end.
Retire the old system
Only when nothing runs through it anymore does the plug get pulled. That deserves a small celebration.
The order follows risk and value: the module that hurts the most goes first, even if another would be easier.
The balance
What stays, what goes.
Fifteen years of system hold fifteen years of business knowledge. That is the most valuable part, and it doesn't get lost.
Stays
Your data and its history
Every customer, every order, every entry moves over completely.
Your rules and special cases
The pricing logic from page 3 of the old manual and the exception for your biggest customer: both get rebuilt, and this time written down.
What has proven itself
Workflows that work stay as they are. Modernization doesn't mean everyone has to relearn their job.
Gets replaced
Code nobody maintains anymore
Replaced by an architecture any developer can build on.
The dependence on one person
Knowledge lives in tests and documentation from now on, not in a single head.
Technology without a future
Discontinued versions and systems without updates go into retirement.
Safety net
The business comes first. Always.
A modernization is only as good as its worst day. So every step is secured before it happens.
Old runs until new proves itself
We only switch over once the new module delivers the same results in parallel operation.
Every step is reversible
If something goes wrong, we switch back. The way back is part of every step, not the emergency plan.
Behavior gets pinned down
Before anything is replaced, tests record what the old system does in detail, quirks included.
More than one head
In the end, documentation, tests and your team understand the system. Not just one person again.
Self-check
How to tell it's time.
No system becomes a problem overnight. It announces itself. Usually like this:
Only one person still dares to touch the code.
The vendor is gone or the product is discontinued.
Updates get postponed because otherwise nothing runs.
New employees need months to find their way around.
Data leaves the system only via export and USB stick.
Good ideas die with the sentence: "Our system can't do that."
More than two checks? Then a conversation is worth it.
Common questions
Four questions that come before every modernization.
No, that is exactly what we avoid. Full rewrites in one go take years and often fail. We first replace the area that hurts the most, and the rest follows in digestible steps.
It moves over completely, history included. Before every switchover we reconcile old and new, and afterwards you can verify it in the system yourself.
It doesn't. Switchovers happen per module, usually outside peak hours, and the old system stays available as a fallback until the new one has proven itself.
Yes. Then we work from the behavior: the database, exports and screens show what the system does. That gets rebuilt, tested, and this time written down.
Next step
How old is the system nobody wants to talk about?
Tell us what it does and where it pinches. We will tell you which module we would carve out first, and how risky that is.