Coexist
Allow old and new systems to operate side by side for as long as the transition requires.
Use Case · Controlled Modernization Cutover
Replace the system without making everything else change at once.
Major replacements become risky when every dependent application has to move in the same cutover window.
Avato creates a stable boundary around the changing implementation so old and new systems can coexist while surrounding applications continue to use consistent interfaces.
The challenge
A big-bang cutover concentrates too much change into one operational event.
Synchronized application changes, rollback planning, outage windows and dependent-system testing can turn a replacement into an enterprise-wide programme even when only one platform is changing.
The Avato approach
Keep the boundary stable while the implementation behind it changes.
Existing interfaces, business representations, routing, transformation and operational policy can remain stable while traffic or processes move between old and replacement environments.
Route deliberately
Change which implementation fulfils an interaction without forcing every consumer to know the difference.
Retain rollback options
Keep the transition bounded so unexpected issues can be handled without redesigning the surrounding architecture.
What stays / what changes
Make the replacement an implementation change, not an enterprise rewrite.
What can stay
- Interfaces used by surrounding applications
- Canonical business representations
- Operational monitoring and exception handling
→
What changes
- The implementation behind the boundary
- Routing between old and new systems
- The pace and sequence of transition
Evidence
See controlled cutover in production.
Avato supported a contact-centre modernization in which legacy and replacement systems coexisted while the surrounding enterprise architecture remained stable.