Aptos owned a large retail system that was written in ASP Classic.  They were in the process of building a full replacement but that system would not be complete for another 18 months.  We were brought in to maintain their current system and provide small enhancements while the in-house team was dedicated to building the replacement system.

With the replacement system still being developed our main goal was to keep the existing system running according to the SLA they had signed with their customers.  However, the timeline for the new system was long enough that they could not refuse to make enhancements to the existing system for such a long time.  Our secondary goal was to implement necessary features in such away that they would easily be migrated to the new system when it was ready.

We combined our development team with the team building the new system so we could share technical information.  We then worked with the product owner to decide which features were important enough to implement in the legacy system, knowing they would need to be implemented again in the replacement.

The legacy system was written in a combination of ASP Classic and ASP .Net 3.8 using MVC.  Since the system would eventually be discarded we made no effort to update the technology, only add new features when absolutely necessary.

When a new feature was identified, our team would work with the team building the replacement system to see how they wanted to implement the feature.  We would then reverse engineer that approach to fit in the legacy system in such a way that user training would be minimal when migrating to the replacement.

Also, we were responsible for maintaining the legacy system uptime agreements and handling any emergency production issues that arose.

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