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Modernizing at Scale: A Fortune 500's Approach to Application Transformation
Read Case StudyWhat does waiting on a large Java or .NET application cost now? Dates nobody controls. And modernizing costs less than it did, because AI coding tools write the code and vFunction gives them what they need.
The reasons were about the project: years of work, a large budget, a real chance of breaking production. Inside the project, they still hold.
The pressure now comes from outside it: attackers working in hours, support ending on fixed dates, and AI-driven development every other application already gets.
What kept modernization expensive was knowing what the application does, deciding what it should become, and proving each change is safe. Now:
Kiro, Claude Code, AWS Transform, and others write the code. On a large application, they need what vFunction supplies.
How the application runs in production, the target architecture your architects define, a spec per domain, and tests from production behavior.
Forward-deployed engineers work inside your environment and codebase with your team, until your team runs the process alone.
For an application on AWS or moving to AWS, AWS funds the vFunction work through its ISV tooling program.
The multi-year rewrite becomes a series of specified, tested changes.
Half of what vFunction delivers is software. The other half is a forward-deployed engineer who has modernized applications like yours.
Onboarded into your environment, the engineer reads the analysis with your team, tunes the specifications against your code, and reviews every change.
Your team does more and the engineer does less, until your team runs the process alone. The capability stays with you.
AWS funds the vFunction work for AWS workloads through its ISV tooling program. Here is how that works in practice.
An application running on AWS, or moving to AWS as part of the modernization.
Often inside an AWS Experience-Based Acceleration with your account team. vFunction handles the funding request; you commit to modernizing on AWS.
vFunction is bought directly or through the cloud marketplaces. Ask us about an application on Azure or on premises.
The qualifier is the application: past 500,000 lines of code or 1,000 classes, Java or .NET, running in production.
AWS Transform, OpenRewrite, Moderne, and others do that, inside the same workflow.
Your security tools report them. vFunction is the path for findings only a code change can close.
It won’t assess a whole portfolio, but we can help find which applications are the best candidates to modernize.
Once modular, the application can take them on. That work is yours.
You probably already know which one. It’s the application with:
Tell us about the application. Which one it is, what it runs on, and what’s forcing the question. An engineer replies, not a scheduler.
End-of-support dates and exploit windows don't wait for model releases. And the system model, specs, and tests you build now are what better tools will need.
No. AWS Transform, OpenRewrite, Moderne, and others handle the framework upgrade. vFunction supplies the architecture context, specifications, and tests around it.
Large Java or .NET applications past 500,000 lines of code or 1,000 classes, running in production. Below that, AI coding tools usually cope alone.
Your team's AI coding tools, such as Kiro, Claude Code, AWS Transform, and others, working from vFunction's specifications, under your team's review.
Your architects, using vFunction's evidence from the running application. vFunction proposes structure; your team sets the boundaries.
Integration tests generated from observed production behavior verify that a rewritten domain behaves like the original before the next domain starts.
vFunction observes which tables each domain touches and includes database migration as a step in the workflow.
Priced per application. For applications on or moving to AWS, AWS funds the vFunction work through its ISV tooling program. See the pricing page.
No. Your security tools report them. vFunction is the modernization path for findings that can only be closed by changing the application.
Which one it is, what it runs on, and what's forcing the question. An engineer replies, not a scheduler.