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Legacy systems: update, stabilize or replace step by step.
Your grown custom software or industry solution is getting on in years? There are two paths, and both are legitimate:
- Update the existing system: updates, security patches, a new server environment, smaller extensions. The system stays, but becomes maintainable again.
- Step-by-step replacement: when continued operation is no longer economical, the old system is replaced module by module with a new application, with complete data migration and without everything switching over on a single day.
Which path is right is what the analysis phase shows. I recommend the one that fits your needs, not the bigger contract.
Replacement in stages, without downtime
Swapping out a legacy system over a weekend sounds sporty and usually goes wrong. More realistic is the step-by-step replacement: module by module goes live, the old system keeps running in parallel until the last area has moved.
What a stage costs is settled before it begins; each one is signed off, and the previous state stays available. If one turns out harder than expected, it affects only that stage, not the whole project.
Data migration, complete and verified
Historical data stays. Customers, orders, documents, histories, attachments: everything is migrated in a structured way, with a test run on a copy and an explicit sign-off before production is switched over.
Even data from 20 years of grown software can be transferred cleanly, including the parts where nobody has understood how it is stored for years. That is usually the most demanding part, and the one inexperienced providers underestimate.
Standard technologies, no dead ends
I build on established, widely used technologies, not on exotic frameworks that will have no developers left in five years. You should be able to get help elsewhere in an emergency.
Source code and rights go to you. No lock-in, no license fees to me.
Keep running or replace: which path is right?
The analysis phase gives you a reliable answer. I recommend the path that fits your needs, not the bigger contract.