From spending days searching through legacy code to finding answers in seconds
Re:App is SUE’s AI tool for the “ reverse architecting ” and modernization of legacy code. Re:App reads your entire codebase, maps out the architecture and dependencies, and helps engineers with refactoring, rebuilding, and replatforming. Re:App runs offline in your own environment or in a secure environment at SUE, and an engineer reviews every change. At Deltares, Re:App mapped out approximately six million lines of Fortran code.
Together with pioneers
Common challenges in Application Modernization
01
Hidden complexity
Complex legacy architectures
Spaghetti code and missing documentation make modernization risky and time-consuming.
02
Human bottleneck
Skills and knowledge gaps
Very few engineers have in-depth knowledge of both legacy and cloud native environments. In many organizations, no one knows exactly how an old application was built anymore.
03
No downtime
Fear of disruption
Business-critical systems cannot afford any downtime, so the transformation must not pose any risk.
Say goodbye to those costly and lengthy modernization projects
Using Re:App drastically reduces your modernization costs by minimizing manual effort and accelerating time-to-value. An experienced team of experts guides the process both during and after the migration, ensuring a smooth and controlled transformation.
SUE uses the same analysis during a technical due diligence to assess the code before an acquisition.
Re:App 's Role at Deltares
Deltares deployed the entire D-Flow FM kernel in Re:App: approximately six million lines of Fortran code resulting from 40 years of development, complete with build configurations and documentation. Previously, a question about the flow of a code path would take developers hours or even days of searching with grep. Now, they simply ask Re:App and, within seconds, see the relevant code, dependencies, and documentation. Read the Deltares case study
A foundation for innovation
Unlock the full potential of cloud native technology. By migrating to a modern cloud native platform, Re:App enables your organization to take advantage of advanced capabilities and accelerate innovation.
Simplify modernization
Re:App Eliminates the complexity of legacy software: AI agents containerize and deploy your applications, and an engineer reviews every change. This eliminates time-consuming manual work.
Fewer resources required
Overcome the challenge of limited skilled resources. Re:App automates the replatforming process, reducing the need for specialized expertise and accelerating project timelines.
There is a better way to modernize
Our ApproachHow does Re:App work?
By combining expert Professional Services with Re:App, we bridge the gap between legacy systems and cloud native solutions. This is how Re:App simplifies and accelerates your modernization process.

Analyze
Reverse Architect AgentMaps out your entire application, including its context and architecture.

Modernize
Refactor and Rebuild AgentsAutomatically restructure code and extract business logic into reusable services using modern integration APIs.

Migrate
Replatform AgentAutomates migrations to the cloud and Kubernetes, with Zero Trust security boundaries and automated CI/CD pipelines.

Manage and optimize
Platform EngineeringManages applications in public and private clouds using standard Kubernetes, a " cloud native " architecture, continuous observability, and GitOps.