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.

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Together with pioneers

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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 Handles build and deployment between development and production on Kubernetes, AWS, or OpenShift, saving both time and money.

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

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Future-Ready Platform

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.

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Simplicity

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.

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Super-efficient

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.

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Your workload on each platform

There is a better way to modernize

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Illustration of the " Re:App" robot behind a laptopOur Approach

How 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.

Step 1

Analyze

Reverse Architect Agent

Maps out your entire application, including its context and architecture.

Step 2

Modernize

Refactor and Rebuild Agents

Automatically restructure code and extract business logic into reusable services using modern integration APIs.

Step 3

Migrate

Replatform Agent

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

Step 4

Manage and optimize

Platform Engineering

Manages applications in public and private clouds using standard Kubernetes, a " cloud native " architecture, continuous observability, and GitOps.


Frequently asked questions

All frequently asked questions
Re:App Among other things, I have analyzed Fortran at Deltares, C# at CarWise, and Java at a large organization in the transportation sector. Re:App also supports COBOL, .NET, and PL/SQL. If your language isn't listed here, please contact me.
That's up to you. Re:App runs offline in your own environment—so the code stays there—or in a secure SUE environment. Your code isn't sent to an external AI service, and we don't use it to train AI models.
First, get an overview of the application: modules, business rules, dependencies, and the connections to the database and interface. Then, your developers ask questions about the code, as they do at Deltares. During the modernization phase, a “ Re:App ” assists with refactoring, rebuilding, and replatforming; a “ engineer ” reviews each change.

Want to see Re:App in action?

Jonah Sanderse
Jonah Sanderse

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