software house devqube

Legacy application modernization

How we saved a system without documentation or support?

Imagine having a system designed to power your business… but being locked out of it. The previous contractor has vanished, leaving you with code that is indecipherable, undocumented, and impossible to develop further.

The Client who approached us found themselves in exactly this predicament: the previous vendor was no longer interested in maintaining the application. Initially, the scope of work covered only a production deployment and the implementation of a few new features. However, our role as a technology partner extends beyond simple "execution." Before commencing any development work, we recommended a strategic product audit. Our goal was to fully understand the inherited asset and its actual technical state, identify potential business risks, and assess possibilities for further development.

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The audit results revealed that superficial modifications to the system would be a highly risky endeavor.

 

 We identified 5 fundamental threats to the application’s stability and maintenance:

 

  • Lack of Documentation: The Client possessed only fragmentary, outdated specifications. Two years of product development had gone undocumented, making any intervention in the code highly unpredictable.
  • Technical Debt: The source code contained numerous inconsistencies, including undocumented, dead code. This made grasping the overall concept and logic of the application difficult.
  • No Control Over Infrastructure: The Client lacked access to key resources (OVH panel, SMTP server, Firebase). De facto, they did not own the application—they were dependent on a third party with whom they had lost contact.
  • Complex Requirements: The Client’s requirements were extensive—ranging from minor fixes and new integrations to resolving infrastructure issues (e.g., delivering activation codes via Gmail).
  • Absence of Testing: Every attempt to modify or add a new feature carried a high risk of regression and unpredictable application behavior.

Our Solution

The audit findings unequivocally indicated that attempts to “repair” and optimize the existing code would be inefficient and fraught with excessive risk. Consequently, we presented the Client with a strategic recommendation: a complete rewrite of the application using modern technology.

 

While this approach ostensibly requires more resources upfront, it was the only path that guaranteed security, scalability, and the achievement of the Client’s long-term business goals.

 

The implementation process included:

 

  • Environment Configuration: We built new, secure environments from scratch. We connected all necessary resources and transferred full administrative rights for the entire infrastructure to the Client.
  • Business Logic Migration: In close cooperation with the Client, we recreated and migrated the business logic from the legacy system. The process was transparent—the Client validated the operation of familiar features on the new platform in real-time.
  • Building Modern Architecture: The choice of new technology was dictated by future development plans (including future integration with a mobile app), securing the Client’s investment for years to come.
  • Test Implementation: We implemented a full suite of tests (unit, integration, acceptance), ensuring system stability and predictability.
  • Documentation Update: We created complete technical documentation reflecting the final structure and functionality of the application.

Results

The final product demo confirmed the validity of the chosen strategy. The Client received a fully functional, stable, and documented end product over which they held full control.

 

Recognizing the potential of the new platform, the Client decided to expand the project with entirely new modules that exceeded original assumptions. These included business process improvements we recommended based on our analysis during the development process.

 

What began as a rescue mission evolved into a permanent partnership. To this day, we provide support services and remain at the Client’s disposal for further software development.

 

Are you taking over a project without documentation, or have you lost technical support?  We will conduct an audit and propose a strategy that turns risk into a market advantage.

Contact us today!

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